[Mailer] Fix sendmail transport failure handling and interactive mode #54572
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#54239 introduced an issue for us when using sendmail in interactive mode using a long running background worker. It will throw exceptions due to an unclean shutdown in case of an SMTP timeout (5 minute by default), while in interactive mode all output is actually handled by the SMTP transport, including that timeout. That makes the exit code of the long running process not relevant in that mode. See the bug report for some more details.
I have verified that this change solves my production issues, although I am not particularly fond on the hoops I had to jump to show this in the test.
cc @aboks