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Email Deliverability: Best Practices and Tactics.
Rating: 4.1 out of 5(74 ratings)
1,139 students

Email Deliverability: Best Practices and Tactics.

Master email deliverability to avoid spam folders in Gmail, Outlook, and Yahoo, and ensure your emails land in inboxes
Created byDaniel Shnaider
Last updated 3/2026
English

What you'll learn

  • What email warm-up is, how it works, and why it's essential for ensuring your emails land in inboxes, not spam.
  • The best strategies to improve email deliverability across Gmail, Outlook, Yahoo, and other major providers.
  • How various factors like domain reputation and email content impact your deliverability.
  • A complete step-by-step guide to boosting your email deliverability and making sure your emails get delivered.
  • Easy tricks to get 60% open rates for cold emails—even if you struggle with writing great subject lines.
  • The #1 method to reduce spam complaints and improve your sender reputation.
  • How to navigate AI spam filters and automated inbox systems to ensure your emails reach their destination.
  • Understanding Authentication Protocols (SPF, DKIM, DMARC)
  • How to manage blacklists, check your domain’s reputation, and avoid being flagged as spam.
  • The importance of list hygiene: maintaining a healthy email list to keep your emails effective and your deliverability high.

Course content

8 sections38 lectures2h 27m total length
  • Introduction3:28

    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!

  • Key Factors Impacting Email Deliverability5:00

    In this lesson, you will learn:


    1. 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.

    2. 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.

    3. 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:

    1. Email content — quality and format (plain text or HTML).

    2. Sender email address — older and actively used addresses have better reputations than new ones.

    3. Domain reputation — affects all senders on the domain.

    4. 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.

  • Causes of Emails Going to Spam3:45

    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.

  • Using Google Postmaster for Reputation Tracking3:28

    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.

  • Key DNS Settings for Deliverability1:57

    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.

  • Spam Filters and Engagement Impact5:10

    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.

Requirements

  • You’ll learn everything you need to know in this course, and we guide you step-by-step through the process.
  • While you don’t need advanced expertise, having some familiarity with email marketing tools (like Mailchimp, HubSpot, or others) will help you follow along easily.
  • To apply what you learn, you should have access to at least one email account (preferably a business email account) to connect and optimize during the course.
  • Be ready to take action with the simple walkthrough videos and practical steps we’ve outlined throughout the course. This course is hands-on, so you’ll be applying the strategies in real-time.

Description

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.

Who this course is for:

  • Marketers curious about email deliverability: If you’re looking to boost your open rates, improve inbox placement, and avoid the spam folder, this course will give you the tools and strategies to take control of your email deliverability.
  • Agencies aiming to increase email campaign effectiveness: If you manage email campaigns for clients, this course will help you optimize your email deliverability, ensuring your clients' emails land in inboxes, not spam.
  • Business owners and entrepreneurs: Whether you're sending cold outreach or marketing emails, this course is ideal if you want to ensure your emails are delivered and engage with your audience effectively.
  • Email marketers seeking to optimize their workflow: If you're already using email marketing tools but need help improving deliverability and overcoming common challenges, this course provides actionable strategies to help you succeed.
  • Anyone dealing with poor email engagement: Whether you're struggling with bounce rates, low open rates, or spam complaints, this course will guide you in solving these issues and boosting your email performance.