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  • From: Michael Howe <address@concealed>
  • To: "address@concealed" <address@concealed>
  • Subject: [sympa-users] Quietly rejecting spam (un)subscribe messages
  • Date: Thu, 28 Aug 2014 18:46:49 +0100

Hello list,

We seem to be getting a lot of spam requests to the
<listname>-subscribe@domain addresses we have for subscribing to lists.
Our upstream MTAs do spam scoring, so I can identify such messages, and
I can even block them by using a reject rule in a scenario. What I
can't do, however, is silently drop the request - even if I use
'reject,quiet' the original address still gets a 'Results of your
commands' message. This creates quite a lot of back-scatter.

I know we can make lists require self-confirmation then owner
confirmation, which means list owners aren't bothered by the spam, but
that still doesn't stop the back-scatter problem.

Is there a way to make Sympa silently drop the messages, or do I need to
submit a bug (and potentially a patch)?

(I could probably do it on the maillist server's MTA, but I'd rather do
it in sympa if possible as that's where all other authorization
decisions are taken.)

Many thanks,


(We're using a slightly customized version of the Debian 6.1.17 package.)
Michael Howe, Systems Development and Support Section
IT Services, University of Oxford

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