On Mon 20/Jun/2022 20:18:04 +0200 Jaroslaw Rafa wrote:
Dnia 20.06.2022 o godz. 20:05:37 Jaroslaw Rafa via mailop pisze:
Mailing lists can operate minimal changes, like this list does, for example.
I received your message with "From: Jaroslaw Rafa <r...@rafa.eu.org>" after
my filter verified that your DKIM signature still validates upon undoing
their changes.
If my domain had DMARC record with p=reject instead of p=none, you would
receive a message with: "From: Jaroslaw Rafa via mailop
<mailop@mailop.org>". You can find a lot of such examples in the messages
from other people on this list. Other mailing lists perform similar
rewriting.
Well, looks like I didn't look at the headers actually :) This list rewrites
"From:" address to the above form even that I don't have p=reject. It
actually seems to rewrite all sender addresses...
So you must use some special filtering in your MUA to see my message as
"From: Jaroslaw Rafa <r...@rafa.eu.org>", because it just doesn't look so.
It is done by the MTA. Documented here:
http://www.tana.it/sw/zdkimfilter/zdkimfilter.html#mlmtrans
I don't want to talk here about specific home-crafted solutions that revert
changes made by mailing lists. I want to talk just about ordinary,
"out-of-the-box" MUAs and MTAs.
Yes, not being "ordinary" is the most common objection to that method of
undoing MLML transformations. However, ARC is not ordinary either, and From:
munging itself only became ordinary quite recently.
Best
Ale
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