> On Dec 13, 2021, at 1:55 PM, Vsevolod Stakhov via mailop <mailop@mailop.org> > wrote: > > 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.
Yeah, the university edge-case was one I could think of where for academic/journalistic reasons both a student and professor would be co-authoring/co-publishing a thing. (Naming order is distinct enough (and matters) in that field, but I'll totally admit it's an extreme outlier). -Dan _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
