Great Circle Associates Majordomo-Users
(July 1995)

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Subject: SUMMARY: anti-spam features
From: era @ ucar . edu (Ed Arnold)
Date: Tue, 25 Jul 1995 10:51:42 -0600 (MDT)
To: majordomo-users @ greatcircle . com
Reply-to: era @ ucar . edu (Ed Arnold)

This posting on majordomo-users is the summary to a question I
(inappropriately) asked on list-managers, about what features of
Majordomo could be used to inhibit Olga and other recent spams.

The replies were mostly:

1. Use "restrict_post" in the per-list config file, available as of
majordomo-1.9x.  This essentially implements an ALLOWED function.

2. If one is really desperate, use the existing moderation facility
and force all the list users to include an "Approved: password" line in
their headers.  (ugh)

It was also pointed out that it is frequently convenient to include a
date in the comment field of addresses on a bounce list, so these can
be removed in a timely fashion at a future time.

These replies pointed to a possible majordomo enhancement that would 
certainly have been useful to me in the past.  The "restrict_post"
implements an ALLOWED function, which inhibits spams by keeping anyone
not sub-scribed to the list, from posting to the list.  It would also be
useful to have a DENIED function, so that specific addresses of ex-list
members who have been hostile, or known spammers, can be kept from
sub-ing or posting to a list, esp. when the list-owner desires to keep
a list in "open" rather than "closed" subscription mode.

Also, to those particularly annoyed by spams, keep in mind that the
"list-outgoing" convention is widely used and it's probably just a
matter of time before spammers discover they are being kept off lists
and decide to try the -outgoing addresses instead.

Ed Arnold * NCAR * POB 3000, Boulder, CO 80307-3000 * yak: 303-497-1253
fax: 303-497-{1848,1804} * smtp: * www:

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