Date: Wed, 18 Mar 1998 10:30:45 -0800 (PST) From: "Eric J. Schwertfeger" <ejs@bfd.com> To: chat@FreeBSD.ORG Subject: Spam containment suggestion Message-ID: <Pine.BSF.3.96.980318100916.28778C-100000@harlie.bfd.com>
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My spam filters got a lot more effective yesterday (doing very demented
and demanding checks like an AOL dialup *MUST* relay through
.*.mx.aol.com, and must be From:.*@aol.com) and the best check so far
seems to be to insist that if something comes to me through a list (as
checked by the Sender: line, that the name of the list must be on the To:
or CC: line. Would this be a reasonable (and possible) restriction to be
implemented by the list itself? I really don't see a good use for BCCing
mailing lists, and would be more effective than me trying to do the same,
because I don't know when a new mail alias for @freebsd.org is going to
pop up, or when a new mailing list will go up.
On a side note, unfortunately, I can't do this on all my email, since I am
on quite a few informal lists. However, I can most certainly do this for
my webmaster@.* addresses, since those should never be BCC'ed to me.
On another sidenote, this filter tripped me up a time or two, mostly
because it seems people use different addresses for the lists:
@freebsd.org, @hub.freebsd.org, and @freefall.freebsd.org, so far. Just
letting you know in case anyone else decides to filter the same way. My
current procmail rule:
:0E
* ^Sender: owner-freebsd-[a-z]+@FreeBSD\.ORG
* !^(to|cc):.* (freebsd-)?[a-z]+@(hub\.|freefall\.)?freebsd\.org
{
SPAMMER="via FreeBSD list but not to FreeBSD list"
LOG="[$SPAMMER]"
}
An enumeration of the Freebsd lists would probably be better than
[a-z]+, since that will still match friends@, but this will catch the
spammers that use periods and numbers.
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