January 27, 2020 8:00 PM, "Tassilo Philipp" <tphil...@potion-studios.com> wrote:
> Ok, I have a better idea now... > >>> a- an envelope is created for each RCPT TO in a transaction... >>> b- ... and additional envelopes may be created by aliases _during_ that >>> RCPT TO >> >> Thanks a ton for those two pointers, I'll investigate and write what I > can >> figure out. > > You correctly guessed a), turns out that my MUA (msmtp, but only when > triggered by mutt) somehow > doubles all RCPT TO addresses (but not always, as said). I'm not sure at the > moment why, but I can > exclude OpenSMTPd from being the culprit. > > I guess this was already going on for months, but previously used MSAs > weren't under my control, so > I never noticed it. Oops. > > Thanks again for your precise answer which pointed me into the right > direction, and sorry that I > didn't check it more thoroughly from the get go. no problem, glad you figured
