https://www.cloudns.net/blog/what-is-smtp-smuggling-how-to-detect-and-prevent-it/
What is SMTP Smuggling? How to detect and prevent it? - ClouDNS Blog
May 21, 2025 - SMTP Smuggling is a method of evading email security by exploiting discrepancies in how various servers interpret and handle SMTP traffic.
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https://www.postfix.org/smtp-smuggling.html
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