[Mailman-Users] Automatic deletion of posts by non-members of a list
brad at stop.mail-abuse.org
Fri May 26 08:03:49 CEST 2006
At 5:32 PM -0400 2006-05-25, Peter C.S. Adams wrote:
> In the old days, this was certainly true, but today, when 70-80% of all
> emails on the internet are spam, you may easily find that rejecting all
> those messages will (a) eat up a lot of your internet bandwidth, and (b)
> exacerbate the problem by telling the "sender" of the message -- which will,
> 90% of the time, be a forged address -- that "their" mail was rejected.
This is a pretty sore point in the business right now.
Which is more important? Wasting your bandwidth, eating up your
MTA resources, and potentially notifying spammers that they didn't
get through? Or simply throwing everything away, including messages
that might have had great personal or business significance?
Think about spam in general. Which is worse? Dealing with large
quantities of spam to try to find the relatively small amount of
legitimate mail? Or throwing everything away that might potentially
be spam, possibly including important messages from your boss, your
spouse, your parents, your children, your co-workers, prospective
business partners, etc...?
Myself, I tend to err on the side of caution. If they've managed
to get through my anti-spam filters and the message fails the test of
whether or not the poster is a subscriber to the list, the best thing
to do is to hold those messages for moderation. Failing that, the
next best thing to do is to attempt to notify the sender that the
message was rejected (making sure to use rate-limiting technology so
as to avoid excessive joe-job blowback).
Only as a last resort is it appropriate to simply throw away
messages that would otherwise have been held for moderation.
But then maybe you've got different kinds of mailing lists where
you don't really care about the content and where the posters don't
really care about the content, and no one is going to get upset if
some messages get thrown away.
Brad Knowles, <brad at stop.mail-abuse.org>
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755
LOPSA member since December 2005. See <http://www.lopsa.org/>.
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