Excessive or fatal bounces

[Markus Koschany]

Hello,

I regularly receive bounce action notifications from mailman about
disabled subscriptions. This is caused by remote SMTP servers rejecting
spam email from pkg-games-***@alioth-lists.debian.net. The recipients
email address is valid and he is an active list member.

How can I avoid that his subscription gets disabled by mailman? I
presume just increasing the value for fatal bounces isn't the best
solution? How can I turn off bounce action notifications? Is there a way
to enable a more efficient spam filter for our mailing list? Currently
we receive way too much spam email and I wonder if there is already a
standard mail filter in place which we could use for our list too?

Regards,

Markus

[Dominic Hargreaves]

There is already extensive spam and virus filtering at a system level,
but it's never going to match an external system exactly. We will work on
improving that when we can, and you can see the current configuration
at https://salsa.debian.org/alioth-lists-team/ansible (mainly the
exim role). Feel free to suggest improvements too!

Meantime, I suggest you set up moderation of non-member posts; that tends
to get rid of most spam without having a large impact on most uses of lists.
Of course, you need to have some fairly regular moderation setup to
ensure that legitimate email is not unduly delayed, and then liberally
whitelist non-spam non-subscriber posters.

Dominic.

Post by Markus Koschany
Hello,
I regularly receive bounce action notifications from mailman about
disabled subscriptions. This is caused by remote SMTP servers rejecting
email address is valid and he is an active list member.
How can I avoid that his subscription gets disabled by mailman? I
presume just increasing the value for fatal bounces isn't the best
solution? How can I turn off bounce action notifications? Is there a way
to enable a more efficient spam filter for our mailing list? Currently
we receive way too much spam email and I wonder if there is already a
standard mail filter in place which we could use for our list too?
Regards,
Markus
_______________________________________________
Mailman mailing list
https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/mailman

[Alex Muntada]

Hi Markus,

Post by Markus Koschany
How can I avoid that his subscription gets disabled by mailman?
I presume just increasing the value for fatal bounces isn't the
best solution? How can I turn off bounce action notifications?

You can tweak or disable bounce processing here:
https://alioth-lists.debian.net/cgi-bin/mailman/admin/pkg-games-devel/bounce

Post by Markus Koschany
Is there a way to enable a more efficient spam filter for our
mailing list? Currently we receive way too much spam email and
I wonder if there is already a standard mail filter in place
which we could use for our list too?

You already have some spam filtering enabled, please find the
details here:

https://alioth-lists.debian.net/cgi-bin/mailman/admin/pkg-games-devel/privacy/spam

On the other hand, I found this article and the script linked
there very useful when dealing with large amounts of spam in
one mailman setup, though you'll have to put non-member posts
on hold, as Dominic suggested:

http://taint.org/2003/08/06/025411a.html

Hope this helps,
Alex

--
⢀⣎⠟⠻⢶⣊⠀
⣟⠁⢠⠒⠀⣿⡁ Alex Muntada <***@debian.org>
⢿⡄⠘⠷⠚⠋ Debian Developer - log.alexm.org
⠈⠳⣄⠀⠀⠀⠀

[Markus Koschany]

Hi,

Am 13.07.18 um 00:42 schrieb Alex Muntada:
[...]

Post by Alex Muntada
On the other hand, I found this article and the script linked
there very useful when dealing with large amounts of spam in
one mailman setup, though you'll have to put non-member posts
http://taint.org/2003/08/06/025411a.html

Hi,

I followed your advice and put non-member posts on hold to reduce the
spam on our pkg-games-devel list. This seemed to work until I discovered
a while ago that my emails to pkg-games-***@lists.alioth.debian.org
are no longer forwarded to alioth-lists.debian.net or they are simply
discarded.

I probably made some mistake in Mailman but I can't figure out what.

For instance if you take a look at bug #908864 [1], you can see that I
and Reiner Herrman have replied to the bug report. However the emails
never arrived on our mailing list. [2]

Any ideas why?

Regards,

Markus

[1] https://bugs.debian.org/908864
[2] [2]
https://alioth-lists.debian.net/pipermail/pkg-games-devel/2018-September/thread.html

[Markus Koschany]

For the record I have just found the solution to this issue. Apparently
multipart/signed messages were discarded. I can't remember that I have
ever touched the content filtering section but pass_mime_types must be
set to the following values to allow GPG signed messages.

application/pkcs7-signature
multipart/signed

plus

multipart/mixed
multipart/alternative
text/plain

which already existed.

Markus

[Alex Muntada]

Hi Markus,

Post by Markus Koschany
For the record I have just found the solution to this issue.
Apparently multipart/signed messages were discarded.

Mailman vette logs confirm it:

Sep 15 11:51:07 2018 (579) Message discarded, msgid: <***@reiner-h.de>'
list: Pkg-games-devel,
handler: MimeDel

Sep 15 19:45:09 2018 (579) Message discarded, msgid: <cf70f7f1-1d01-1162-0219-***@debian.org>'
list: Pkg-games-devel,
handler: MimeDel

Post by Markus Koschany
I can't remember that I have ever touched the content filtering
section but pass_mime_types must be set to the following values
to allow GPG signed messages.

Thanks, I found a mix of values for signed messages in lists that
have MIME filtering on. You may want to consider adding also
«application/pgp-signature».

Cheers,
Alex

--
⢀⣎⠟⠻⢶⣊⠀
⣟⠁⢠⠒⠀⣿⡁ Alex Muntada <***@debian.org>
⢿⡄⠘⠷⠚⠋ Debian Developer - log.alexm.org
⠈⠳⣄⠀⠀⠀⠀