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Enable Postfix SMTP Smuggling protection, introduced in Postfix 3.8.4, which is, currently, only available within the nixpkgs' master branch. - https://github.com/NixOS/nixpkgs/pull/276104 - https://github.com/NixOS/nixpkgs/pull/276264 For information about SMTP Smuggling: - https://www.postfix.org/smtp-smuggling.html - https://www.postfix.org/postconf.5.html#smtpd_forbid_bare_newline