On Mon 20/Jun/2022 19:48:50 +0200 Slavko via mailop wrote:
Dňa 20. júna 2022 16:53:41 UTC používateľ Alessandro Vesely via mailop
<mailop@mailop.org> napísal:
Plus, use of SPF with DMARC - even with rewriting - causes the same problem
as with mailing lists.
Yes, you have to rewrite From: as well, if you alter the message.
RFC 5321, sect. 3.9 Mailing Lists and Aliases
...
When a message is delivered or forwarded to each address of an
expanded list form, the return address in the envelope ("MAIL FROM:")
MUST be changed to be the address of a person or other entity who
administers the list. However, in this case, the message header section
(RFC 5322 [4]) MUST be left unchanged; in particular, the "From" field of
the header section is unaffected.
Section 3.9 is perhaps the worst one in that document. By that wording, the
addition of /any/ header field is forbidden, including List-*.
[...] Or, as often happens, we will get another RFC, which will try to solve
these conflicts (and IMO introduces another).
That's right. In the upcoming version of the standard that sentence is removed:
https://datatracker.ietf.org/doc/html/draft-ietf-emailcore-rfc5321bis#section-3.4.2
Best
Ale
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