On Mon 13/Dec/2021 19:08:03 +0100 Jan-Pieter Cornet via mailop wrote:
On 13-12-21 18:52, Franck Martin via mailop wrote:
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.
I agree with Franck.
Multiple addresses in the From: is extremely rare. At XS4ALL, we've been
rejecting such messages since we implemented DMARC in 2012. The only rejects I
ever saw were from misconfigured senders. We received zero complaints in the 9
years we've been doing this.
I can count on the fingers of my hands the number of times where I've been
composing an email message together with someone else —a coauthor, that is. In
those cases, it is correct to disclose such multiple authorship. This can be
done in the text, in the bottom signature, or adding coauthor names in the
display phrase part of From:, while also adding Cc:s to them. However, the
formally correct method to grant authorship should be to set proper From:
mailboxes.
Best
Ale
--
_______________________________________________
mailop mailing list
mailop@mailop.org
https://list.mailop.org/listinfo/mailop
