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 
>> 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

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