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mademast / sail

✉️ A strictly standards compliant SMTP server
ISC License
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Undeliverable messages #31

Open gennyble opened 2 years ago

gennyble commented 2 years ago

We have to generate undeliverable messages. The old code that used to do that was a casualty of the message strictly typing.

gennyble commented 2 years ago

5231 says, in 3.6.3. Message Submission Servers as Relays, that we should send undeliverables as one one of these formats, if possible: