Hi,
I checked it way back, and nearly all the cases were due to configuration
errors on the sender part.
It is not a feature that is actively used in the wild. I don’t know of any
email client that allows you to do that. So someone needs to craft a specific
message and inject it.
Now, when DMARC was brought in, having 2 different domains in the RFC 5322
from: does not allow DMARC to function. Technically, DMARC can work if all the
domains in the RFC5322 from are the same, but I guess it is just easier to
reject such message as the impact is close to zero and often multiple From is
just a strong signal of badness/spam.
If you know of an active useful use case, I’m curious.
From: mailop <mailop-boun...@mailop.org> on behalf of Alessandro Vesely via
mailop <mailop@mailop.org>
Date: Monday, December 13, 2021 at 09:23
To: mailop <mailop@mailop.org>
Subject: [mailop] Gmail rejects multiple From:'s. Who else?
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
--
_______________________________________________
mailop mailing list
mailop@mailop.org
https://list.mailop.org/listinfo/mailop
_______________________________________________
mailop mailing list
mailop@mailop.org
https://list.mailop.org/listinfo/mailop
