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* Do you know what SMTP smuggling is?


Suggested article: What is SMTP Smuggling? How to detect and prevent it?

SMTP smuggling is an advanced cyberattack that targets email servers by exploiting how they handle SMTP traffic differently. This technique allows attackers to bypass security measures and deliver malicious content undetected, such as phishing emails or malware.

Attackers use header manipulation to inject or modify SMTP headers, tricking some servers into treating the email as legitimate while others interpret it differently. This discrepancy allows malicious emails to bypass security filters.

Another common method involves exploiting parsing differences between email servers. By sending a specially crafted message, attackers take advantage of the inconsistent ways different servers interpret email commands, allowing harmful content to slip through security gateways.

The attack works by causing confusion in how boundaries between the email's header, body, or MIME parts are interpreted. This mismatch in interpretation allows malicious content to pass undetected.

To mitigate SMTP smuggling, organizations should use advanced security tools, keep email servers updated, and implement email authentication protocols like DMARC, SPF, and DKIM. Regular monitoring of email traffic and educating employees about phishing attempts can also help reduce the risk.

Want to learn more? Check out more about the impact of SMTP Smuggling!