Alessandro Vesely writes:
Sam, when I receive a message with, say:From: <u...@example.com> To: <l...@example.org> those non-compliant headers get changed to: From: u...@example.com To: l...@example.org I'm unclear on where the angle bracket removal happens. The code in submit.C seems to be concerned with submission rather than reception (also because it entails a "511 Headers specify no recipients that I never saw on incoming mail.)
submit.C handles all mail, but only locally-submitted mail have their headers reformatted, and not in submit.C but sendmail.c
If there's any intermediate step in your mail path, such as maildrop or .courier forwarding the message somewhere, that can come across as a locally-submitted mail, that's subject to header rewriting. Header rewriting occurs in sendmail.c, which only gets invoked via the command line, or by external script. courieresmtpd.c runs submit directly, no header rewriting takes place in that path.
Is there a way to avoid that modification? The problem is that fixing them breaks any DKIM signature that signed them.
Yes, well, the only thing that can be done is to eliminate any external steps in the mail path.
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