On 2021-07-09, Saarts, Erik <erik.saa...@vty.ee> wrote: > We have domain A on cloud, from where mail gets forwarded to our local > server to domain B. Forwarding is done in > SPF-compliant way by using SRS (this part we have no control > over).=C2=A0=C2=A0This SRS address ends up in > Return-Path header, and sieve vacation replies to=C2=A0this address. > > > This is all absolutely correct, but also useless, as sending mail to > SRS address leads nowhere.
That's a broken SRS setup then, if it doesn't handle responses to the sender address there will be some lost mail. Vacation and similar auto responses are _required_ to reply to the SMTP sender address.
