SLUG Mailing List Archives
[SLUG] ADMIN: Spam, how we're fighting it, and why you should stop talking about it...
- To: slug@xxxxxxxxxxx
- Subject: [SLUG] ADMIN: Spam, how we're fighting it, and why you should stop talking about it...
- From: Mary Gardiner <mary@xxxxxxxxxxx>
- Date: Wed, 1 Oct 2003 12:24:06 +1000
- Cc: slug-owner@xxxxxxxxxxx
- Cc: committee@xxxxxxxxxxx
- Reply-to: committee@xxxxxxxxxxx
- User-agent: Mutt/1.5.4i
There has been considerable discussion, less constructive than it could
have been, on slug@xxxxxxxxxxx about spam getting through to the main
mailing list. Posts to spam-related threads are currently outnumbering
spam by an order of magnitude, so the list admins hope that this mail
will be the last of them.
Before the recent spams that got through, this was what the list admins
were doing to try to prevent spam getting through:
- using Postfix's checks for valid sender domains and so on;
- passing all posts to the mailing list through SpamAssassin, and
moderating any posts that scored 3 or more; and
- passing all posts to the mailing list through a number of custom
In response to recent spam that got passed onto slug@xxxxxxxxxxx we
- upgraded SpamAssassin to version 2.60 which no longer gives negative
scores to mails with valid In-Reply-To and References headers;
- considerably customised the SpamAssassin scores based on spam that SA
wasn't catching; and
- added further header checks.
Pete Hardy in particular has spent a lot of hours working on SLUG's spam
filtering in the last week.
On average, the list admins prevent somewhere between 6 and 10 spams per
DAY from reaching slug@xxxxxxxxxxx. Postfix spam checks block around 700
spam per month, and SpamAssassin around about the same again. See
http://slug.org.au/cgi-bin/mailgraph.cgi for some more stats.
At the next SLUG meeting, financial members will be given the
opportunity to vote on whether slug@xxxxxxxxxxx should become a closed
list -- that is ALL posts from people who aren't subscribed (and posts
from subscribers posting from another address) would be held for
If you're interested in changing list policy in response to spam, please
vote at the next monthly meeting. If you are not going to attend the
monthly meeting and are a financial member wishing to vote on the list
policy, please email secretary@xxxxxxxxxxx with a proxy vote. If you are
not a financial member, you may join at the meeting, or by sending a
cheque for $12.50, together with a note containing your name, email
address, and postal address, to the address listed at
http://www.slug.org.au/contacts.html (make sure it reaches us before the
In the meantime, let's get SLUG's signal to noise ratio back to normal.