> 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
