
In this course, you’ll gain a comprehensive understanding of email deliverability and learn how to ensure that your emails consistently land in the inbox, not the spam folder.
Whether you're sending cold emails, newsletters, or marketing campaigns, email deliverability is crucial for ensuring your messages are seen and acted upon by your recipients. Throughout this course, you’ll discover the best practices, tools, and strategies for optimizing deliverability, boosting engagement, and maintaining a strong sender reputation.
What you'll learn:
Key factors that impact email deliverability, from domain reputation to email content and IP reputation.
How to set up and monitor DNS settings, SPF, DKIM, DMARC, and more, to ensure optimal email security and deliverability.
Effective techniques for email warm-up, including how to gradually increase your sending volume without damaging your domain reputation.
How to track and improve inbox placement, avoid spam traps, and monitor your email performance with tools like Google Postmaster and Warmy.
Best practices for cold email outreach, newsletter campaigns, and B2B or B2C email strategies, ensuring high engagement and maximum inbox reach.
By the end of this course, you’ll have all the knowledge and tools you need to enhance your email deliverability and ensure that your emails reach their intended recipients, every time. Let’s dive in!
In this lesson, you will learn:
The difference between email delivery and email deliverability
Email delivery means sending an email to the recipient’s mail server, while email deliverability is the ability of that email to land in the recipient’s inbox instead of spam or other folders.
Why email deliverability matters
High deliverability increases the chances of your emails being opened, engaged with, and converting, ensuring effective communication with customers and prospects in both B2B and B2C markets.
Inbox placement test
Shows the percentage of emails that successfully reach the inbox in major email providers such as Gmail, G Suite, and Outlook. A 100% inbox placement rate indicates excellent deliverability.
Four key factors that impact deliverability:
Email content — quality and format (plain text or HTML).
Sender email address — older and actively used addresses have better reputations than new ones.
Domain reputation — affects all senders on the domain.
IP reputation — important if using a dedicated IP; limited control when using shared IPs like Mailchimp’s.
How to influence these factors:
Email content is fully in your control and can be optimized.
Sender reputation improves with consistent and positive email sending (warming).
Domain owners can work on improving domain reputation.
Dedicated IP owners can influence IP reputation, while users of shared IPs have little control.
Additional tools and recommendations
Automated tools and proper configurations help boost deliverability and campaign effectiveness.
In this lesson, you will learn:
How email content impacts deliverability Even if your domain and IP reputations are good, poor email content can cause your emails to land in the spam folder and ruin your overall deliverability.
Using tools to check spam triggers in plain text
You can use free tools like Warmy’s spam filter checker to identify “spammy” words in your plain text emails that increase the chance of triggering spam filters.
Understanding plain text vs. HTML emails
Plain text emails (simple text without design) are less likely to be caught by spam filters, especially for cold outreach, while HTML emails (designed newsletters) are more likely to land in spam or promotional tabs.
Recommendations for cold emails
Cold emails should ideally be sent as plain text to avoid spam filters, whereas HTML is better suited for newsletters or emails expected by subscribers.
Monitoring domain and IP reputation with Google Postmaster Tools
Google Postmaster Tools is a free and highly recommended service to track and monitor your domain and IP reputation, which is essential for maintaining good deliverability.
Next steps
Setup instructions for Google Postmaster Tools and further tips are covered in upcoming lessons of Warmy’s Inbox Academy.
In this lesson, you will learn:
How to add your domain to Google Postmaster
Adding your domain involves creating a TXT record in your DNS settings. This allows Google to verify your domain and start tracking its reputation.
When data appears in Google Postmaster
Data only appears after you have sent a sufficient volume of emails (around 2,000 emails) specifically to Gmail addresses. Small senders may not see data immediately or at all.
Tracking domain and IP reputation
Google Postmaster shows domain reputation and IP reputation over time. The goal is to maintain a “high” reputation level to avoid spam and increase inbox placement.
Dedicated vs. shared IP addresses
If you own a dedicated IP, you can influence its reputation. Shared IPs, typically used by major sending platforms, have limited control over reputation.
Understanding the promotions tab vs. spam
The promotions tab is not spam but a categorization feature by email providers like Gmail. While better than spam, it’s still preferable to reach the primary inbox.
Next steps to improve deliverability
Google Postmaster is a key tool, but there are other methods and tools to further improve deliverability and boost conversion rates, which will be covered in upcoming lessons.
In this lesson, you will learn:
Which technical settings affect email deliverability
Key DNS records such as SPF, DKIM, DMARC, rDNS, MX, and A records play a crucial role in your email’s ability to reach the inbox.
Importance of setting up these records before sending emails
Proper configuration of these technical settings is essential before starting any email campaigns to ensure good deliverability.
How Warmy helps monitor your technical setup
Warmy automatically detects whether your email account’s DNS records are correctly set up when you connect your mailbox.
Available tools for basic record setup
Warmy provides free tools to help configure basic SPF and DMARC records, suitable for getting started, while more advanced setups may require further customization.
Step-by-step approach to deliverability analysis
Start by checking your technical DNS records (SPF, DKIM, DMARC), then review your domain and IP reputation, and finally analyze your email content to get the full picture of deliverability.
Next steps: deeper dive into spam filters
Upcoming lessons will cover spam filter mechanisms in more detail to help you further improve your email success.
In this lesson, you will learn:
How spam filters work
Spam filters use complex, unpublished algorithms researched by companies to analyze your email content and sender behavior to decide where your emails land.
Content analysis by spam filters
Filters scan your email for certain words and patterns, now enhanced by AI technologies, to detect potential spammy content.
Engagement-based filtering
Spam filters track how recipients interact with your emails—opens, clicks, scrolling—and adjust delivery accordingly. Low engagement leads to more emails being marked as spam.
Reputation impact on filtering
Google Postmaster tracks domain and IP reputation; low reputation increases the chance your emails go to spam.
Spam rate thresholds
If more than 0.3% of your emails are marked as spam by recipients (3 out of 1000), Google may classify you as a spammer and apply stricter filters.
Spam traps and their role
Spam traps are fake email addresses created by companies to catch spammers. Sending emails to these traps signals bad sending practices and damages your reputation.
Cold emailing and ESP policies
Email service providers (ESPs) actively use spam traps and engagement metrics to detect and limit cold email campaigns, making deliverability challenging.
Conclusion
Completing step one of Warmy’s Inbox Academy marks the beginning of your deliverability mastery journey.
This lesson covers the critical role of SPF, DKIM, and DMARC in securing your email domain and improving deliverability. We’ll explain how these authentication protocols work to prevent spoofing, verify sender identity, and instruct email providers on handling unauthorized emails. Then, we’ll walk through a step-by-step setup guide for each record and explore how they help build trust and strengthen your sender reputation. Finally, we’ll dive into repairing domain and IP reputation using tools like Google Postmaster Tools, Microsoft SNDS, and Warmy. By the end, you’ll have the knowledge to properly authenticate your emails and boost deliverability.
In this lesson, you will learn:
The importance of setting up SPF, DKIM, and DMARC records to protect your domain from impersonation, increase email deliverability, and ensure your messages reach the inbox. These settings are crucial for preventing fraud, phishing, and spoofing attacks, which can damage your reputation and reduce email success.
SPF (Sender Policy Framework): SPF ensures that only authorized mail servers can send emails on behalf of your domain. This prevents scammers from impersonating your email address and sending fraudulent emails.
DKIM (DomainKeys Identified Mail): DKIM adds a digital signature to your emails, confirming that the message was genuinely sent by you and hasn’t been altered during transit.
DMARC (Domain-based Message Authentication, Reporting, and Conformance): DMARC works alongside SPF and DKIM to protect your domain by instructing email servers on how to handle unauthorized emails.
Without these essential technical setups, your domain is vulnerable to phishing attacks, spoofing, and other forms of email fraud, which can significantly harm your domain’s reputation and lead to emails being flagged as spam.
Key Benefits of Technical Setup:
Prevents Spoofing and Phishing: These protocols help secure your domain and prevent unauthorized actors from pretending to be you.
Improves Email Deliverability: Properly set-up records ensure that your emails pass security filters, which increases your chances of reaching the inbox.
Simple to Set Up: Once configured, these settings work automatically and require little ongoing maintenance.
Practical Steps:
Set Up SPF and DKIM Records: Use Warmy’s free tools to generate SPF and DMARC records for your domain.
Ongoing Protection: These settings continuously protect your domain and improve your deliverability as long as they are properly configured.
Make sure to configure SPF and DKIM when you purchase new domains to avoid future deliverability issues. Use Warmy’s free SPF and DMARC generator tools to make the process easy and efficient.
In this lesson, you will learn:
What DNS Is: DNS (Domain Name System) acts as the address book of the internet, directing traffic to the right email servers and ensuring smooth delivery of emails and other services.
A-Records: Understand the role of A-records in mapping domain names to IP addresses. They ensure your website and email servers are correctly linked.
MX Records: Learn how MX records guide email traffic to the right mail server. Proper configuration of MX records is crucial to email deliverability.
RDNS (Reverse DNS): Discover how RDNS ensures your IP address matches your domain name, improving email deliverability and preventing emails from being flagged as spam.
How to Set DNS Records in Warmy: Walk through how to configure DNS settings for your domain using Warmy’s tools. This includes setting up MX records, A-records, and more to enhance deliverability.
Testing DNS Settings: Learn how to use Warmy to automatically check and configure your DNS settings for optimal email performance.
Why This Matters:
Correct DNS settings are fundamental for ensuring emails are delivered to inboxes and not marked as spam. They help protect your sender reputation, allowing you to maintain good deliverability and avoid email spoofing.
Warmy’s automatic tools simplify the DNS setup process, ensuring your email campaigns reach their destination without complications.
In this lesson, you will learn:
Dedicated vs Shared IPs: Understand the difference between dedicated and shared IPs, their impact on sender reputation, and how they influence deliverability.
IP Reputation Management: Learn how to manage your IP reputation, the importance of authentication protocols like SPF, DKIM, and DMARC, and how Warmy helps maintain your reputation with gradual warm-up.
Regular Monitoring: Discover why continuous monitoring is essential for maintaining a strong sender reputation. Learn about Warmy’s monitoring tools, including inbox placement tests, template checks, and seed lists.
RDNS (Reverse DNS): Learn how proper RDNS configuration ensures email deliverability. Understand how RDNS links your IP to your domain name and the potential impact of misconfigurations on your emails reaching the inbox.
Warmy’s Technology: Explore how Warmy automates the warm-up process, ensures correct RDNS setup, and provides ongoing monitoring to improve deliverability.
This lesson covers the importance of IP management and RDNS configuration for ensuring emails consistently land in the inbox. Understanding these concepts will help protect your domain reputation, improve email performance, and prevent emails from being flagged as spam.
In this lesson, you will learn:
What email warm-up is
Email warm-up is the gradual increase in the volume of emails sent from a new, old, or inactive domain to build or recover its sender reputation. It’s a process that helps establish positive engagement with emails, preventing them from landing in spam.
Why warm-up is essential for new domains
When sending cold emails from a new domain, there’s a high probability that emails will land in spam due to lack of reputation. The warm-up process builds reputation by sending emails to a controlled group of accounts where the messages are opened, marked as important, and engaged with.
How warm-up improves domain reputation
The warm-up process helps your domain gain trust from spam filters by showing positive engagement. This increases the chances of emails reaching the inbox rather than the spam folder.
Maintaining reputation with continuous warm-up
Email warm-up isn’t a one-time process; it needs to be maintained continuously. Without it, your domain and IP can deteriorate, just like how neglecting fitness can harm your health. Regular warm-up helps maintain the health of your domain and IP.
The importance of warming up before sending large email volumes
Before sending a large number of emails, warming up your domain is critical. Without this process, the probability of your emails landing in spam is high, especially when sending thousands of cold emails or newsletters.
How Warmy automates the warm-up process
Warmy’s advanced automation uses machine learning and AI to optimize the warm-up process. It analyzes various data points, including the domain’s history, sender behavior, and IP reputation, to ensure the best possible engagement strategy.
The role of machine learning in Warmy’s system
Warmy’s AI learns from each email account connected, analyzing patterns and applying this knowledge to optimize email sending strategies for different email providers (Gmail, Outlook, etc.), improving reputation faster.
Continuous research and improvements
Warmy’s system is constantly evolving through research and real-time testing to improve its warm-up strategies and ensure high deliverability.
In this lesson, you will learn:
Key features of Warmy’s dashboard
Warmy provides an easy-to-use dashboard where you can track the status of your email accounts, domain reputation, DNS scores, and deliverability tests.
Customizable warm-up settings
You can select the language for the warm-up process, the topic of the warm-up (e.g., financial, gaming, etc.), and whether to use B2B or B2C email accounts for interaction to match your outreach needs.
Running deliverability and placement tests
Warmy allows you to run placement tests with your own email templates to see how your emails perform with B2B or B2C providers like Microsoft 365, Zoho, Gmail, etc., ensuring they don’t end up in spam or promotional folders.
Template management
You can add and warm up your own email templates, both plain text and HTML, and integrate with HubSpot for easy access to templates directly from the platform.
Google Postmaster integration
Warmy can connect to your Google Postmaster account to pull data and analyze your domain’s reputation, helping to improve deliverability based on real-time data.
Seed List for email providers like Mailchimp
For email providers that don’t allow direct connection (like Mailchimp), Warmy offers a Seed List—email addresses that simulate engagement to help warm up and improve reputation without connecting directly to your email provider.
Email list validation
Before sending large volumes of emails, Warmy recommends using its email validation tools to ensure your email list is clean and minimize bounce rates.
Organizing and tracking email accounts
You can group your senders by domain or customer, making it easy to track and manage multiple accounts and monitor their progress.
In this lesson, you will learn:
Manual email warm-up
Manual warm-up involves subscribing to newsletters or creating multiple email accounts to send emails to friends and family. The recipients then engage with the emails by replying, opening, or marking them as important. While this method is free, it’s very time-consuming and not scalable for larger email campaigns.
Auto email warm-up
Automated warm-up is a more scalable and sophisticated approach. It intelligently chooses when to send emails, with whom, and how frequently, ensuring better engagement without the heavy manual work. However, automation is not free, as it requires using specialized tools like Warmy for optimal results.
Manual vs. automated warm-up
Manual warm-up can work for smaller, personal outreach campaigns but lacks scalability. Automated warm-up is ideal for businesses or larger campaigns, offering a more efficient way to improve email deliverability and reputation without spending excessive time.
In this lesson, you will learn:
Challenges with cold email outreach
Cold emails are often seen as spammy by email providers, which try to limit their reach. Despite this, it’s possible to succeed with cold outreach by carefully managing deliverability.
Importance of multiple domains
Buying many domains and warming them up in advance improves your ability to send large volumes of cold emails. Older domains generally have better deliverability, so planning early is beneficial.
Validating email addresses
Using email verification tools to clean your lists helps protect your domain reputation and reduces bounce rates.
Testing your messaging
It’s crucial to test whether your email content and templates successfully reach inboxes and resonate with recipients using tools that check spam triggers and inbox placement.
Monitoring domain reputation
Connecting domains to services like Google Postmaster (for Gmail) or SNDS (for Outlook) enables tracking of reputation and performance to spot issues early.
Domain rotation and recovery
Sending emails through multiple domains and rotating between them helps maintain consistent deliverability. Domains that perform poorly should be “sent to the hospital” (paused) to recover reputation through warm-up.
No fixed sending limits per domain
There’s no universal number of emails you can send per domain daily. Lower sending volumes reduce risk but balance this with your business needs and ROI calculations.
In this lesson, you will learn:
What spam traps are
Spam traps are fake email addresses created by anti-spam organizations and ISPs to identify and block spammers by marking their IP and domain as spam sources.
How spam traps are created
Spam traps can be disguised as fake LinkedIn profiles, fake companies with websites, old inactive domains, or generic email addresses like sales@ or marketing@, making them difficult to detect.
Why spam traps exist
They help email providers like Gmail, Outlook, and Yahoo detect spammers and protect users from unsolicited emails.
How hitting spam traps affects you
Sending emails to spam traps can severely damage your domain and IP reputation, leading to poor deliverability or blacklisting.
How to avoid spam traps:
Regularly clean and remove inactive or unengaged contacts from your email lists.
Use double opt-in methods to confirm subscribers are real and interested.
Avoid buying or scraping email lists, which often contain spam traps.
Monitor engagement and remove recipients who never open or interact with your emails.
Use email validation tools (like Warmy) to identify risky addresses, including known spam traps.
Limitations and risks
Spam traps are constantly evolving, with new ones created regularly by anti-spam organizations, so no method guarantees 100% protection. Careful list management and validation are your best defenses.
Final advice
Build your own email lists carefully and remain vigilant to protect your domain and IP reputation while conducting cold email outreach.
In this lesson, you will learn:
What AB Testing Is
AB testing, or split testing, is a method to compare two versions of an email to determine which one performs better in terms of key metrics like open rates, click-through rates, and overall engagement during the warm-up phase. This helps identify which template works best for inbox placement.
Setting Up AB Tests
Learn how to create two variations of your email templates (e.g., different subject lines or content formats) and send them to similar audience segments to measure which one lands in the inbox more effectively.
Best Practices for AB Testing
Focus on testing one variable at a time (such as subject lines or email body), ensure a sufficiently large audience for reliable results, and limit the number of simultaneous tests to avoid overwhelming your workflow.
Optimizing Your Warm-Up with AB Testing
With Warmy, you can easily set up and analyze AB tests, enabling you to continuously improve the effectiveness of your email templates during the warm-up phase and ensure better inbox placement.
This lesson covers the essentials of AB testing specifically for email warm-up campaigns, helping you optimize your email templates to improve deliverability, increase engagement, and enhance the overall performance of your cold email outreach.
In this lesson, you will learn:
Why warm-up doesn’t end after campaigns start
Many senders treat warm-up as a one-time process, but mailbox providers continue evaluating your behavior under real sending conditions. Stopping warm-up abruptly can create unnatural sending patterns that may negatively affect reputation.
Running warm-up alongside real campaigns
Instead of replacing warm-up, real outreach should run in parallel with ongoing warm-up activity. This helps maintain stable engagement signals and supports consistent sending behavior over time.
Protecting domain reputation during live outreach
Real campaigns always involve risk — some recipients may ignore emails or mark them as spam. Continuous warm-up generates additional positive interactions such as opens and replies, helping balance negative signals.
Importance of recipient engagement
Mailbox providers closely monitor how users interact with your emails. Positive engagement strengthens reputation, while spam complaints or immediate deletions weaken deliverability. This makes list quality and targeting critical even after warm-up is completed.
Maintaining consistent sending patterns
Sudden spikes or drops in sending volume can trigger filtering systems. Gradual scaling and steady activity help establish trust with mailbox providers.
Ongoing monitoring and performance tracking
Tracking key deliverability indicators such as spam complaint rate, bounce rate, inbox placement results, and reputation metrics (e.g., Google Postmaster data) helps detect issues early and maintain healthy sending performance.
Deliverability as an ongoing strategy
Warm-up becomes part of a long-term sending environment rather than a temporary step. Combining real engagement with continuous warm-up ensures stability, protects reputation, and supports sustainable campaign scaling.
In this lesson, you will learn:
What newsletters are
Newsletters are designed, HTML-rich marketing emails typically sent to subscribers who have opted in to receive them. They resemble web pages in format and content.
Why HTML emails should not be used for cold outreach
Designed HTML emails tend to trigger spam filters when sent as cold emails, so plain text emails are recommended for cold outreach instead.
Subscriber engagement with newsletters
Newsletters are sent to people who have agreed to receive marketing emails, which helps improve deliverability and engagement.
Performance metrics from real campaigns
Examples from HubSpot show statistics like bounce rates, open rates, click rates, unsubscribe rates, and spam reports. Bounce rates often result from unverified or inactive email addresses.
Importance of link clicks and engagement
Clicks on links within newsletters (e.g., social media links) help strengthen domain reputation and indicate positive engagement.
Limitations of open rates
Open rates are an imperfect metric and should not be relied on solely. Actual engagement, such as clicks and replies, provides better insight into campaign success.
Next lessons focus on segmentation
Upcoming sections will cover email segmentation strategies to protect your domain and IP reputation while improving outreach effectiveness.
In this lesson, you will learn:
Connecting your email account
Step-by-step instructions to connect Google Workspace or Microsoft 365 mailboxes to Warmy. Microsoft 365 offers a faster, simpler connection process.
Setting warm-up preferences
Customize how your email warm-up distributes sending between providers (e.g., 50/50 between G Suite and Microsoft 365) to best match your B2B outreach needs.
Adding email templates
Upload plain text templates for cold emails or HTML templates for newsletters. Templates help train spam filters to recognize your messages as legitimate.
Integration with HubSpot
Warmy can pull templates directly from your HubSpot CRM to streamline warm-up and deliverability testing.
Scheduling weekly automatic placement tests
Set up automated weekly tests to monitor how your emails perform across different providers and with different templates, ensuring ongoing deliverability.
Analyzing deliverability metrics
Track inbox placement rates by provider, aiming for 90-95% deliverability. Lower rates may be caused by new or damaged domains or sending emails outside Warmy simultaneously.
Using mailbox temperature metrics
Monitor your recommended daily sending volume during warm-up to maintain domain health—balancing sending like “junk food” with warm-up as “going to the gym.”
Validating email addresses
Regularly verify your recipient lists to reduce bounce rates, which harm your domain reputation. Warmy offers credits to validate up to 10,000 emails with options to purchase more.
In this lesson, you will learn:
Myth About Fixed Sending Limits
There is no universal rule for how many emails you can send daily or how frequently. The ideal volume depends on many factors unique to your domain and recipients.
Using Performance Data to Guide Volume
Start with a small sending volume and gradually increase based on metrics like domain and IP reputation (e.g., via Google Postmaster), click rates, and conversions.
Recommended Ramp-Up Approach
Begin with around 10 emails per day on a warmed-up domain, then increase daily (linearly or exponentially) while closely monitoring results to avoid damaging reputation.
Monitoring Tools
Google Postmaster is a key tool for tracking domain reputation and deliverability when sending to Gmail addresses.
Next Lessons
Further guidance on volume and frequency will be covered in upcoming lessons.
In this lesson, you will learn:
1. Recommended Cold Email Sending Volume: Discover the ideal number of cold emails to send per day based on domain age and reputation, from 10 to 300 emails.
2. The Warm-Up Process: Understand the importance of warming up a new domain for at least a month before sending cold emails.
3. Gradual Ramp-Up: Learn how to gradually increase your cold email volume starting with 10-20 emails per day and working up to 150-300 emails.
4. Spreading Volume Across Multiple Domains: The benefits of using multiple domains to reduce risk and maintain email deliverability.
5. Optimal Strategy: Stick to a maximum of 20-40 cold emails per domain for the best deliverability results and minimal risks.
This lesson will help you balance cold email volumes with warm-up processes and guide you through sending strategies to maintain good domain health and email performance.
In this lesson, you will learn:
The difference between deliverability and warm-up
Deliverability is the overall ability of your emails to reach the inbox consistently. Warm-up is only one part of this process. It helps establish trust but does not guarantee inbox placement.
How mailbox providers evaluate your reputation
Providers analyze multiple signals such as domain and IP reputation, authentication setup (SPF, DKIM, DMARC), spam complaint rate, bounce rate, engagement levels, sending patterns, and content performance over time. Deliverability is the combined result of all these factors.
What warm-up is designed to do
Warm-up is a controlled reputation-building process for new or inactive domains and mailboxes. It generates positive engagement signals like opens, replies, and inbox interactions to help establish baseline trust with mailbox providers.
What warm-up does NOT do
Warm-up does not maintain your reputation automatically once real campaigns begin. Poor list quality, sudden volume spikes, authentication issues, or high spam complaints can quickly reduce deliverability even after a successful warm-up phase.
Why deliverability is dynamic and ongoing
Mailbox providers continuously update your reputation based on every campaign and recipient interaction. Long-term inbox placement requires consistent sending discipline, clean data, gradual volume scaling, and ongoing monitoring.
The correct mindset for sustainable inbox placement
Warm-up prepares your sending infrastructure, but your operational behavior sustains deliverability. Treat deliverability as a system that requires постоянное управление и оптимизацию to scale outreach predictably.
In this lesson, you will learn:
Using Warmy’s deliverability test
How to access and run the free deliverability test to check whether your emails land in the inbox, spam, or promotions folders across various providers.
Choosing your sending source
Select whether you send emails from an individual email account or through marketing platforms like Mailchimp, Salesforce, or HubSpot. For platforms like Mailchimp, adding a code to your message is required for accurate tracking.
How the test works
Warmy rotates recipient addresses regularly to provide live and updated results. You send your test message to these addresses and analyze where it lands.
Iterating your message
Test different message versions—simple text, marketing HTML, cold emails—and adjust content to eliminate spam triggers until your deliverability indicators show all green (inbox).
Analyzing test results
Review which providers deliver your emails to the inbox and which place them in spam or promotions. Focus on the providers important to your audience.
When persistent spam issues occur
If emails always land in spam regardless of message changes, the issue likely lies with sender reputation, domain reputation, or IP reputation rather than the message content.
In this lesson, you will learn:
How Email Templates Impact Deliverability
Even if your domain and IP reputation are solid, poorly crafted email templates can still trigger spam filters, preventing your emails from landing in the inbox. This lesson explores how to optimize your templates to improve deliverability.
The Role of Link Reputation
The links included in your email templates play a critical role in deliverability. If the reputation of the linked domain is poor, it could result in your message being flagged as spam. It’s essential to ensure that any links you add come from trusted sources.
Diversity in Your Emails
Personalization and message diversity are key to avoiding spam filters. A template with just the recipient’s name and your own isn’t enough. The more personalized data you incorporate into your emails, the better the chance of avoiding spam detection.
Optimizing Subject Lines and Content
Shorter emails with well-crafted subject lines tend to perform better. Aim for concise, engaging content that avoids common spammy words and patterns that email providers flag.
Using Warmy’s Tools for Optimization
Warmy’s template checker can help you analyze your emails for spammy words, bad links, or length issues. The tool ensures your emails are ready for optimal engagement and deliverability.
Best Practices for Templates:
Use plain text emails where possible.
Ensure the reputation of links is solid to avoid being flagged as spam.
Regularly test and update your templates based on results like open rates and conversions.
Final Advice
Optimizing your email templates can account for 30-40% of your overall email success. By avoiding spammy words, ensuring link reputation, and diversifying your content, you can significantly improve your email deliverability.
In this lesson, you will learn:
Introduction to Mailbox Balancing
Mailbox balancing is a feature within Warmy that allows you to customize your warm-up process by distributing your efforts across multiple email providers (ESPs) such as Gmail, Microsoft 365, Outlook, and Yahoo, based on the needs of your target audience.
User-Level and Sender-Level Customization
You can adjust settings at both the user and sender levels. The user-level settings apply across all mailboxes, while the sender-level settings allow you to fine-tune preferences for specific mailboxes. This flexibility ensures that each email account is optimized for its target audience.
Manual vs. Automated Balancing
Manual balancing gives you the freedom to allocate warm-up efforts as you see fit, but can be time-consuming. With automated balancing, Warmy’s AI takes control, distributing warm-up efforts across multiple ESPs automatically. Both methods help target the right audience for your campaigns.
Targeting B2B vs. B2C Audiences
The warm-up strategy should vary depending on whether you are targeting B2B or B2C audiences. For B2B campaigns, you can allocate a larger portion of the warm-up to providers like G Suite, Microsoft 365, and Zoho Pro. For B2C campaigns, focus more on personal email providers such as Gmail, Outlook, and Yahoo.
Setting Percentages for Each Provider
In the settings, you can allocate specific percentages of your warm-up efforts to each email provider. For instance, if you’re running a B2B campaign, you might allocate 30% to Microsoft 365, 20% to Outlook, and the remaining 50% to Gmail.
Consistency Across Campaigns
It’s important to ensure consistency in your warm-up efforts across campaigns. Sender-level settings take priority over user-level settings, so be sure to set the right preferences for each mailbox. This ensures that the warm-up process is always aligned with your campaign goals.
Importance of Correct Provider Selection
Choosing the right providers for your audience is crucial. If you are running a B2B campaign but focus too much on personal providers like Gmail, your emails may not build a solid reputation with corporate filters, which can negatively affect deliverability.
With Warmy’s mailbox balancing, you can strategically allocate your warm-up efforts to the right providers, ensuring improved email deliverability for both B2B and B2C campaigns. Customizing your settings helps you target the right audience, avoid deliverability issues, and maximize the effectiveness of your cold email outreach.
In this lesson, you will learn:
This lesson explains how blacklists affect email deliverability and how to get delisted. We cover common blacklists (Barracuda, Spamhouse, Sue RBL), and guide you on how to check if your IP/domain is blacklisted. Warmy helps you monitor your reputation and fix issues quickly.
Key Takeaways:
What is Blacklisting? Blacklists flag spammers, impacting email deliverability.
How to Check: Use tools like Barracuda, Spamhouse, and Sue RBL to check blacklisting status.
Prevention Tips: Clean email lists, authenticate emails (SPF, DKIM, DMARC), and gradually ramp up volume.
How Warmy Helps: Monitor your domain/IP health in real-time with Warmy’s AI tools to track blacklists and optimize warm-up strategies.
In this lesson, you will learn:
How Warmy solves email deliverability issues
Warmy addresses the four main factors impacting deliverability: email content, sender address, domain reputation, and IP reputation, using advanced technology and continuous improvement.
Connecting your email accounts via IMAP and SMTP
You can connect almost any email provider to Warmy to track deliverability performance and fix issues across domains and mailboxes.
Dashboard insights at domain and mailbox levels
Warmy’s dashboard shows detailed stats for domains, including DNS records (SPF, DKIM, DMARC), connection to Google Postmaster, and placement test results with various providers.
Placement test monitoring
Run placement tests regularly to see how your emails perform with providers like Outlook, G Suite, and Microsoft 365, identifying where deliverability issues may exist.
Customizing warm-up engagement by provider
Adjust the weight of warm-up efforts toward specific providers (e.g., Microsoft 365) if you experience issues, allowing targeted reputation improvement.
Global settings for all accounts
Configure warm-up preferences across all connected email accounts from your profile for consistent management and optimization.
Warmy as a “deliverability doctor”
Warmy acts as an expert system, diagnosing and fixing deliverability problems automatically, saving time and improving email performance.
In this lesson, you will learn:
What the Seed List is
A feature that provides lists of verified email addresses (Gmail, premium Gmail, Outlook, Yahoo) to help improve your email reputation.
How to use the Seed List
Download the seed list and upload it to your email service provider (ESP) or marketing system to send emails that generate positive engagement like opens, clicks, replies, and moving emails out of spam or promotions.
Difference between Gmail and premium Gmail seeds
Premium Gmail seeds consist of a smaller, unique, and highly clean set of users with limited senders allowed, ensuring higher quality for reputation improvement.
Engagement activities performed by seeds
The seed emails are engaged with by real people or bots simulating behaviors such as scrolling, marking as important, replying, and moving emails to inbox from promotions or spam across multiple devices.
Use cases for the Seed List
Ideal for marketers using platforms like Klaviyo, Mailchimp, or even own SMTP servers who want to boost domain and IP reputation without directly connecting email accounts to warm-up tools.
API availability
An API will be available soon, allowing users to access seeds programmatically without downloading lists, for easier integration.
In this lesson, you will learn:
Adding and managing templates in Warmy
You can add plain text, HTML, or import templates from HubSpot to Warmy’s dashboard for cold emails, newsletters, or transactional messages.
How Warmy uses your templates
Warmy sends a mix of your templates and its own generated messages from selected mailboxes to create positive engagement signals with email providers.
Spam filter checks
Warmy checks your templates for spammy words, allowing you to edit flagged content to improve deliverability before sending.
Generating positive engagement
Emails sent with your templates are opened, marked as important, replied to, and moved out of spam/promotional folders by Warmy’s network, signaling relevance to providers like Gmail, Outlook, and Yahoo.
Why template engagement matters
This process tells email providers that your messages are wanted and legitimate, reducing chances of landing in spam or promotions and increasing open and click rates.
Critical role of messaging in deliverability
Your email content, alongside sender address, domain reputation, and IP reputation, significantly affects deliverability. Warmy helps monitor and improve all four areas.
In this lesson, you will learn:
What Adeline is and how it helps
Adeline is Warmy’s AI assistant designed to help you understand and improve your email deliverability by guiding you through technical setups and best practices.
Connecting Google Postmaster
Adeline explains the importance of linking your domain to Google Postmaster to monitor domain reputation, spam rates, and authentication, which are critical for inbox placement.
Understanding your DNS score
DNS records like SPF, DKIM, and DMARC are foundational for email health. A score of 8 out of 10 is solid, but improving these records can further enhance deliverability and sender reputation.
Adding templates to warm-up
Uploading your email templates to Warmy’s warm-up process helps simulate real engagement (opens, marks as important, stars) that signals email providers your messages are valuable, improving template-specific deliverability.
Template validation
Warmy checks your templates for issues like spammy words or long subject lines before sending them to prospects, acting as a safety net.
Personalized support offer
Adeline offers assistance for setup and troubleshooting, providing a helpful, conversational support experience.
In this lesson, you will learn:
Setting Up Notifications
How to configure notifications for when something goes wrong with your domains and IPs. Stay informed through email, SMS, Slack, or webhooks.
Seed List Updates
The importance of setting notifications for when the seed list is updated, helping improve your deliverability, domain, and IP reputation.
Tech Automation
or tech-savvy users, set up webhooks to automate notifications for seed list updates and other key events.
Warm-Up Pause Alerts
Be notified whenever your warm-up process is paused, allowing you to take action and maintain domain health.
Adeline AI Integration
Use Warmy’s AI assistant, Adeline, to get help with solving issues and optimizing your email deliverability process.
This video highlights how to stay on top of domain and IP health with real-time alerts, ensuring your email deliverability remains optimized.
In this lesson, you will learn:
Dashboard Navigation
How to move through the new Warmy interface, understand the layout, and locate the key sections of the platform.
Mailbox Details & Warm-Up Control
How to configure mailbox temperature, set warm-up preferences, adjust provider distribution, and align warm-up language and topic with your real outreach.
Performance Monitoring
How to read deliverability metrics, activity charts, mailbox temperature, and provider breakdowns to track reputation growth over time.
Email Deliverability Testing
How to run placement tests, interpret inbox, spam, and promotions results, enable Weekly Auto-Test, and focus analysis based on your B2B or B2C audience.
Templates Management
How to create, assign, and manage templates, understand their role in warm-up, and use built-in tools to optimize content before sending.
Adeline AI & Support
How to use Adeline AI directly inside the dashboard for real-time guidance, and when to involve the Warmy support team for deeper troubleshooting.
This video gives you a complete overview of the new 2026 Warmy's dashboard so you can confidently configure your mailbox, monitor performance, and optimize deliverability.
Tired of wasting time and money on email marketing strategies that don’t deliver results? This course will show you exactly how to improve your email deliverability, ensuring your emails always land in the inbox and not the spam folder in Gmail, Outlook, Yahoo, and other major providers.
If you’re looking for a step-by-step guide to mastering email deliverability and driving lead generation, you’ve come to the right place.
Email remains one of the most powerful marketing tools, but with ever-changing algorithms and regulations, it's easy to get lost in the weeds. This course will help you navigate the complex world of email deliverability with the latest best practices for 2025.
In this course, email deliverability experts at Warmy will walk you through proven strategies to optimize your email content, design, and sender reputation. You’ll learn how to avoid common mistakes that hurt your deliverability and how to ensure your emails reach the inbox, not the spam folder.
Specifically, you’ll learn:
The latest trends and regulations in email deliverability for 2025
How to optimize your email content and design to improve deliverability
Best practices for building and maintaining a strong sender reputation
How to avoid spam filters and ensure your emails reach the inbox
How to track and analyze key deliverability metrics to improve your results
By the end of the course, you’ll have the knowledge and tools to dramatically improve your email marketing results. Whether you’re a marketer, small business owner, or just someone who sends emails, this course is essential for mastering email deliverability and staying ahead in the world of digital marketing.