One thing that would still be missing is SRS [1], in case you want to forward mails to an email address handled by a different mail server. Your mail server mu

One thing that would still be missing is SRS [1], in case you want to forward mails to an email address handled by a different mail server. Your mail server must not use the original from address in the envelope from, as that would very likely trigger SPF record checks at the receiving end. When forwarding mails, it is therefore strictly necessary to rewrite the envelope from address with SRS. For this postfix setup, postsrsd [2] can be used to implement SRS with only a few more configuration options. [1] https://en.wikipedia.org/wiki/Sender_Rewriting_Scheme https://en.wikipedia.org/wiki/Sender_Rewriting_Scheme [2] https://github.com/roehling/postsrsd https://github.com/roehling/postsrsd