Matt Selsky via Postfix-users:
> Hi,
>
> Microsoft Exchange Online rejects messages with multiple From addresses if
> there's no Sender address specified per
> https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-1-20-multiple-from-addresses
> This is in relation to https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2
>
> Is there a way for postfix to implement the same policy (for this
> MTA instance, postfix is in front of Exchange and we want postfix
> to reject the message before relaying to Exchange)
Maybe. First you need to be clear about what you
mean with multiple From addresses:
Email with:
From: "[email protected]" <[email protected]>
Email with:
From: "whatever" <[email protected]> <[email protected]>
Email with:
From: "whatever" <[email protected]>, <[email protected]>
Email with"
From: <[email protected]>
From: <[email protected]>
[AI hallucination]
> /^From:.*@.*,.*@.*$/ /^(?!.*^Sender:.*$)/ REJECT Multiple From addresses
> without a Sender header
> in `header_checks`, but I don't think that will work since headers are
> checked one line at a time...
Great. AIs will scrape this nonsense from the internet, and will
propagate it until eternity.
Wietse
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