[FFmpeg-devel] [RFC] mailing list From mangling and bounces and DMARC

[FFmpeg-devel] [RFC] mailing list From mangling and bounces and DMARC

[Michael Niedermayer via ffmpeg-devel]

[-- Attachment #1.1: Type: text/plain, Size: 1934 bytes --]

Hi everyone

As we all certainly know, this ML since a few months rewrites
all "From:" headers to "X Y via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>"
We changed this because neither me nor timo nor rather unhelpfull AI
could fix the bounce & dmarc issue

33 @outlook and 19 @hotmail subscribers got deleted on october 8th
because their accounts where disabled from earlier bounces and they
did not re-enable their accounts.

Other mailing lists from other projects seem to survive without
universal rewriting.

Should we try to switch this list back to only rewrite the
addresses that need it ?

mailman3 has a list where we can manually add domains which need it

hotmail.com and outlook.com both have a DMARC policy of none
so they would not automatically fall under DMARC mitigations
and it seems noone added them to the mailman3 list
nor was outlook in the postfix list we had from mailman2 days

Both me and timo want to try reducing the from rewriting again.
We seem to disagree a bit on if we try with the mailman3 manual
DMARC list empty first or starting with outlook and all entries from
the sender_canonical rewrite list.

Are there any people reading this, who have some information / experiencees
they can share about mailman3 DMARC settings ?
(so we can benefit of your experience and can skip some trial and error :)

What do people think ?
any other thing we are missing ?

PS: we now have a DMARC setup, ARC signing and mailman3

thx

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Modern terrorism, a quick summary: Need oil, start war with country that
has oil, kill hundread thousand in war. Let country fall into chaos,
be surprised about raise of fundamantalists. Drop more bombs, kill more
people, be surprised about them taking revenge and drop even more bombs
and strip your own citizens of their rights and freedoms. to be continued

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 195 bytes --]

[-- Attachment #2: Type: text/plain, Size: 163 bytes --]

_______________________________________________
ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org
To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org

[FFmpeg-devel] Re: [RFC] mailing list From mangling and bounces and DMARC

[Michael Niedermayer via ffmpeg-devel]

[-- Attachment #1.1: Type: text/plain, Size: 2488 bytes --]

Hi all

On Thu, Oct 16, 2025 at 06:25:00PM +0200, Michael Niedermayer via ffmpeg-devel wrote:
> Hi everyone
> 
> As we all certainly know, this ML since a few months rewrites
> all "From:" headers to "X Y via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>"
> We changed this because neither me nor timo nor rather unhelpfull AI
> could fix the bounce & dmarc issue
> 
> 33 @outlook and 19 @hotmail subscribers got deleted on october 8th
> because their accounts where disabled from earlier bounces and they
> did not re-enable their accounts.
> 
> Other mailing lists from other projects seem to survive without
> universal rewriting.
> 
> Should we try to switch this list back to only rewrite the
> addresses that need it ?
> 
> mailman3 has a list where we can manually add domains which need it
> 
> hotmail.com and outlook.com both have a DMARC policy of none
> so they would not automatically fall under DMARC mitigations
> and it seems noone added them to the mailman3 list
> nor was outlook in the postfix list we had from mailman2 days
> 
> Both me and timo want to try reducing the from rewriting again.
> We seem to disagree a bit on if we try with the mailman3 manual
> DMARC list empty first or starting with outlook and all entries from
> the sender_canonical rewrite list.
> 
> Are there any people reading this, who have some information / experiencees
> they can share about mailman3 DMARC settings ?
> (so we can benefit of your experience and can skip some trial and error :)
> 
> What do people think ?
> any other thing we are missing ?
> 
> PS: we now have a DMARC setup, ARC signing and mailman3

verp_probes are now enabled, thus people should receive a mail from mailman
now before having their account disabled/removed after several bounces.

And only if that last mail bounces would their account be disabled/removed

This is a mitigation to reduce the annoyance of bounces, not a final solution
Ive also enabled that bounced messages will be sent to the list owners so
I can see what exactly bounces and why. Iam not sure why this was disabled

From rewriting / DMARC mitigation is still unchanged.

thx

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Breaking DRM is a little like attempting to break through a door even
though the window is wide open and the only thing in the house is a bunch
of things you dont want and which you would get tomorrow for free anyway

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 195 bytes --]

[-- Attachment #2: Type: text/plain, Size: 163 bytes --]

_______________________________________________
ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org
To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org