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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 email attack that exploits how different email servers handle SMTP instructions. Instead of a direct attack, it takes advantage of discrepancies in how servers interpret these commands, allowing malicious content to bypass security filters unnoticed. Attackers craft emails that appear legitimate to some servers but reveal harmful content when processed by others.

This technique involves manipulating email headers or adding extra instructions to create inconsistencies between servers. For example, an email might pass through the first server as safe, while a server later in the chain uncovers the hidden malicious payload.

Preventing SMTP smuggling requires a shift in approach:

• Security solutions must evolve: Traditional email filters may not be enough. Use email security solutions that can perform in-depth protocol inspection to detect manipulation attempts.
• Standardize email server configurations: Minimize the differences between how your organization’s email servers handle SMTP traffic by adhering to consistent security policies across all servers.
• Layered defense strategy: Beyond technology, human awareness is key. Ensure employees recognize signs of dangerous emails, even when they pass initial defenses.

With a combination of smarter technology and well-trained personnel, organizations can reduce the risks posed by SMTP smuggling and maintain the integrity of their email systems. To learn more about saveguard of this attack, check out our dedicated page about how to detect and prevent SMTP smuggling.