> when I try to send an email from u...@example.com it works
> without a problem, but as soon as I try the same using Thunderbird as an MTA
> it changes the from to "u...@examle.com"@primary_hostname.com
There are at least two solutions, the one I use:
control = submission/domain=
(with nothing after "domain=").
Search your confing for the word "submission".
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