Email Security Foundation

Explore email threats, including phishing, malware, spam, and business email compromise, and how attackers steal data, disrupt systems, and cause financial and reputational damage.

Identify the varieties of spam emails, including commercial, phishing, malware, and scam formats, and understand their impact and how to protect through email security gateways, filters, and user training.

Identify malicious emails and the malware they carry, including viruses, ransomware, spyware, and adware, delivered via attachments or links, and recognize warnings like suspicious senders, misspellings, and unusual domain names.

Identify phishing as an online threat and learn to recognize standard email phishing, malware phishing, spear phishing, CEO fraud, SMS messages, and voice phishing, while reporting incidents and changing passwords.

Explore how business email compromise unfolds through reconnaissance, account takeover, and impersonations to fraud and exfiltrations, and learn practical defenses like verification procedures and MFA.

Learn how brand impersonation attacks exploit trusted brands through phishing, smishing, and fake websites; identify warning signs and deploy email security and employee education to protect your brand.

Learn how extortion email attacks operate, including ransomware, sextortion, and fake virus alerts, and discover practical steps to recognize, report, and prevent these threats with strong passwords, MFA, updates, backups.

Examine account takeover email attacks (ATO) and how phishing, fake websites, and social engineering enable theft, and learn protection with strong passwords, two-factor authentication, cautious clicking, and monitoring.

Discover how conversation hijacking injects malicious replies into email threads, including fake invoices with altered bank details. Protect yourself with security awareness, MFA, AI-powered detection, and strict verification for transfers.

Learn how DoS and DDoS attacks target email servers, disrupt availability, and exhaust resources, and explore protection strategies like firewalls, rate limits, anti-spam and cloud-based AI security.

Discover core email security objectives—confidentiality, integrity, availability, and sender authentication—and learn practical practices like strong passwords, MFA, spam filtering, updates, training, and encryption to protect against phishing.

Learn how email security gateways act as a multi-layer defense between your mail server and the outside world, filtering spam, malware, and threats with DLP, encryption, sandboxing, and continuity.

Explore how MX records direct email delivery by specifying a domain’s mail servers with priority values for redundancy, and how A records (IPv4) and IPv6 addresses support delivery.

Explore the architecture of an on premise email security gateway and how it inspects inbound and outbound mail, updating net settings and connectors accordingly.

Explore the cloud email security gateway architecture, configure domain verification and dns records (mx and spf), and optimize inbound and outbound mail flow with connectors and firewall rules.

Explore a multi-layered email security gateway that blocks threats at the perimeter, enforces policies, enables outbound and inbound filtering, content scanning, DLP, encryption, and continuity.

Explore reputation block lists (RBLs) and how email security gateways block spam, detailing IP-based, domain-based, URI-based, and hash-based lists and how to protect deliverability.

Explore how rate control in email security gateways limits inbound and outbound messages, uses time-based throttling and logging to prevent spam floods and protect domain reputation.

Explore sender authentication with SPF, DKIM, and DMARC to prevent email spoofing and phishing, verify sending sources via DNS records, and improve deliverability and brand protection.

Learn how spam scores rate emails using gateway analysis, with factors like sender reputation, content quality, authentication (SPF, DKIM, DMARC), and user feedback, and how thresholds drive automated actions.

Content filtering acts as the first line of defense by scanning email text, headers, and attachments to block spam, phishing, and malware using keyword rules and quarantine.

Explain how email encryption uses asymmetric cryptography with public and private keys to safeguard confidentiality and integrity, enabling secure mail to recipients via PGP, S/MIME, or TLS/SSL.

Adopt essential email security best practices and combine security awareness with technical controls like MFA, encryption, and email authentication (DMARC, DKIM, SPF) to prevent phishing and data loss.

Explore Barracuda email gateway defense architecture, showing inbound and outbound mail flows, DNS MX records, domain verification, SPF setup, policy and ATP options, via a hands-on demo.