> But no matter what, any action in smtpd.conf is a command that is going
> to get executed and a process has to have a owner, so there is going to
> be a system user involved.

Thank you for the explanations, this is clearer.

What about RFC 1891? Is there an option to disable use of additional parameters
such as ORCPT [1] to ensure compatibility with smtp tools that does not support
this standard?

[1] https://tools.ietf.org/html/rfc1891#section-5.2


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