[Mailman-Users] Nonsubscribers attacking one of my lists.

Robert Heller heller at deepsoft.com
Sat Jan 19 21:55:17 EST 2019

At Sat, 19 Jan 2019 13:58:08 -0800 "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:

> One of my forums has suddenly been inundated with posts to the list by non-subscribers, 
> most of which seem to be coming from some homosexual list somewhere. 
> These seem to be coming from every place in the world.
> I receive notices from Mailman every time I check my e-mail listing of 4 to a dozen 
> non-subscribers attempting post to the forum, and I have to go to my admin database and 
> remove and block each one.
> Is there some way to prevent these jerks from showing up in the database at all?

Check the message headers -- there might be common patterns.  Look for 
Received: headers with "unknown" -- this is a giveaway that the messages are 
using spoofed From: headers.  Also look at the From: address, sometimes these 
messages are coming from partitular domains.

There are spam filters and sender filters.  When the regexp matches, one 
option is to *silently* discard the message.

*If* you have access to the inbound MTA's configuration, there are things 
there that can drop or bounce the messages at that point.

> Ken Gordon
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Robert Heller             -- 978-544-6933
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