On 13/12/2021 17:19, Alessandro Vesely via mailop wrote:
Hi,
I assume everybody knows that RFC 5322 allows multiple mailboxes in the
From: field. This feature existed in RFC822 already. I think it is to
be used for those cases where multiple persons are authoring a message,
albeit adding the list of coauthors is usually not done. This message
is an example. How many rejects does it yield?
Gmail reacts like so:
Action: failed
Status: 5.0.0
Remote-MTA: dns; gmail-smtp-in.l.google.com [108.177.119.27]
Diagnostic-Code: smtp; 550-5.7.1 [192.0.2.4 13] Messages with
multiple addresses in From:
550 5.7.1 header are not accepted. do22si22787062ejc.211 - gsmtp
Is it customary to reject messages with multiple addresses in From:? Why?
Best
Ale
This is a clear case where RFC is wrong and bogus when one takes into
consideration other Internet standards, for example DMARC or even DKIM.
There is also a clear way to implement the behaviour you've described
without such a violation: just add a Reply-To header with multiple
addresses.
Rspamd has a high score rule to penalize messages with multiple from, as
I've seen just spam with multiple from headers in practice like other
people in this mailing list.
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