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Tom Lane heads up

Just dropping a quick not for Tom Lane. I sent a personal message
today, but I wasn't sure if you'd get it after I remembered all of the
spam filters you've got set up.

Sorry for the off topic post.

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Nov 23 '05
69 6425
On Tue, Apr 20, 2004 at 01:06:18AM -0400, Tom Lane wrote:
Will Trillich <wi**@serensoft .com> writes:
is there some way of getting a look at tom's or marc's filters? i could
sure use a bit of help there. lordy, we're close to drowing in the
stuff!


Tell me about it :-(

I currently use four levels of filtering:

1. DNSBL lists: blackholes.five-ten-sg.com, bl.spamcop.net, relays.ordb.org
(there are others out there, but these seem to have a good impedance
match to my personal spam load).

2. Private blacklist of IP ranges that have sent me too much spam.
sendmail has a pretty easy mechanism to support this, although it
only seems to support /8 /16 or /24 ranges which is a bit coarse.
(If you've gotten a "Go away spammer" bounce from me, you were caught
by this filter --- let me know and I'll tighten the ranges.)

3. I have noticed that bouncing any machine that sends "HELO
sss.pgh.pa.us" gets rid of a ton of spam and viruses. I don't know of
any real clean way to do this, but I have a sendmail.cf hack for it.

4. Very long list of procmail filters on header and body patterns.


It must be pretty difficult maintain these header and body patterns
and the others lists. I had same problem and I resolve if by
"spamassass in", it knows learn and it's more simple than procmailrc
coding. Now I have cca 5% of all spams in my INBOX.

Karel
--
Karel Zak <za***@zf.jcu.c z>
http://home.zf.jcu.cz/~zakkr/

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Nov 23 '05 #21
On Tue, Apr 20, 2004 at 05:35:51AM -0000 I heard the voice of
Jim Wilson, and lo! it spake thus:
Tom Lane said:

3. I have noticed that bouncing any machine that sends "HELO
sss.pgh.pa.us" gets rid of a ton of spam and viruses. I don't know of
any real clean way to do this, but I have a sendmail.cf hack for it.


#3 looks interesting though...


I've been blocking HELO as anything under my domain, as well as my IP
address (as well as any bare IP addresses) for a while, and it
certainly drops a fair bit. And I maintain a long list of HELO names,
AND IP ranges, AND sending hostnames, AND senders domains, plus all
the filtering I do after accepting the mail... Wacky. If we just
renamed 'spam' to 'justifiable homicide'...
--
Matthew Fuller (MF4839) | fu******@over-yonder.net
Systems/Network Administrator | http://www.over-yonder.net/~fullermd/

"The only reason I'm burning my candle at both ends, is because I
haven't figured out how to light the middle yet"

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Nov 23 '05 #22
Karel Zak wrote:
It must be pretty difficult maintain these header and body patterns
and the others lists. I had same problem and I resolve if by
"spamassass in", it knows learn and it's more simple than procmailrc
coding. Now I have cca 5% of all spams in my INBOX.


It's not that difficult here but I'm using Postfix, which has built in
pattern checking. Because my mail server also hosts a bunch of topical
internet mailing lists (mainly motorcycle and bass player stuff) and all
of their admin addresses were harvested by spammers long ago, I don't
just get one copy of spam. I usually get several because each of those
admin addresses eventually alias back to me.

I don't use SpamAssassin or Razor but I manage to kill 95% of spam at
the SMTP stage, before the message is accepted for delivery. This works
better than a delivery stage mail processor like procmail because it
bounces the spam back to the server actually sending it. It's easy to
see from the maillogs what IPs are regularly sending me this crap so
they can be blackholed permanently. I think I've got most of CHINANET
in the bit bucket now <g>.

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Nov 23 '05 #23
On Mon, 19 Apr 2004, Joe Conway wrote:
Marc G. Fournier wrote:
Huh? I just use Spamassassin myself, with Razor/Pyzor/DCC and Bayes all
enabled ...


I use exactly the same setup. But recently I've noticed that the
spammers are getting smarter -- I think 20% of it is slipping by the
filters. I'm going to need something better.


do you force learn those spam that get through the cracks? I get about 20
or 30 messages that slip through the cracks, which I process through with
sa-learn nightly ...

----
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email: sc*****@hub.org Yahoo!: yscrappy ICQ: 7615664

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Nov 23 '05 #24
Marc G. Fournier wrote:
do you force learn those spam that get through the cracks? I get about 20
or 30 messages that slip through the cracks, which I process through with
sa-learn nightly ...


No, I haven't been doing that, but I guess I ought to start. Thanks for
the suggestion!

Joe

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Nov 23 '05 #25
On Tue, Apr 20, 2004 at 05:35:51AM -0000 I heard the voice of
Jim Wilson, and lo! it spake thus:
Tom Lane said:

3. I have noticed that bouncing any machine that sends "HELO
sss.pgh.pa.us" gets rid of a ton of spam and viruses. I don't know of
any real clean way to do this, but I have a sendmail.cf hack for it.


#3 looks interesting though...


I've been blocking HELO as anything under my domain, as well as my IP
address (as well as any bare IP addresses) for a while, and it
certainly drops a fair bit. And I maintain a long list of HELO names,
AND IP ranges, AND sending hostnames, AND senders domains, plus all
the filtering I do after accepting the mail... Wacky. If we just
renamed 'spam' to 'justifiable homicide'...
--
Matthew Fuller (MF4839) | fu******@over-yonder.net
Systems/Network Administrator | http://www.over-yonder.net/~fullermd/

"The only reason I'm burning my candle at both ends, is because I
haven't figured out how to light the middle yet"

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Nov 23 '05 #26
Marc G. Fournier wrote:
do you force learn those spam that get through the cracks? I get about 20
or 30 messages that slip through the cracks, which I process through with
sa-learn nightly ...


No, I haven't been doing that, but I guess I ought to start. Thanks for
the suggestion!

Joe

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Nov 23 '05 #27
On Tue, 20 Apr 2004, Joe Conway wrote:
Marc G. Fournier wrote:
do you force learn those spam that get through the cracks? I get about 20
or 30 messages that slip through the cracks, which I process through with
sa-learn nightly ...


No, I haven't been doing that, but I guess I ought to start. Thanks for
the suggestion!


Also check to make sure that you don't have autolearn disabled ... you
would have had to do it manually, as it is enabled by default, but, for
instance, if you are a user on a system, the site-wide may be set to
disable autolearn, so you'd have to enable it yourself ...

I'm looking forward to 3.x coming out, as the Bayes stuff will be able to
run out of an SQL database instead of flat files ... so servers running
Cyrus IMAPd, where there are no physical user accounts, will be able to
start makng use of Bayes as well ...

----
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email: sc*****@hub.org Yahoo!: yscrappy ICQ: 7615664

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Nov 23 '05 #28
On Tue, 20 Apr 2004, Joe Conway wrote:
Marc G. Fournier wrote:
do you force learn those spam that get through the cracks? I get about 20
or 30 messages that slip through the cracks, which I process through with
sa-learn nightly ...


No, I haven't been doing that, but I guess I ought to start. Thanks for
the suggestion!


Also check to make sure that you don't have autolearn disabled ... you
would have had to do it manually, as it is enabled by default, but, for
instance, if you are a user on a system, the site-wide may be set to
disable autolearn, so you'd have to enable it yourself ...

I'm looking forward to 3.x coming out, as the Bayes stuff will be able to
run out of an SQL database instead of flat files ... so servers running
Cyrus IMAPd, where there are no physical user accounts, will be able to
start makng use of Bayes as well ...

----
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email: sc*****@hub.org Yahoo!: yscrappy ICQ: 7615664

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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match

Nov 23 '05 #29
Quoting "Matthew D. Fuller" <fu******@ove r-yonder.net>:
On Tue, Apr 20, 2004 at 05:35:51AM -0000 I heard the voice of
Jim Wilson, and lo! it spake thus:
Tom Lane said:

3. I have noticed that bouncing any machine that sends "HELO
sss.pgh.pa.us" gets rid of a ton of spam and viruses. I don't know of
any real clean way to do this, but I have a sendmail.cf hack for it.


#3 looks interesting though...


I've been blocking HELO as anything under my domain, as well as my IP
address (as well as any bare IP addresses) for a while, and it
certainly drops a fair bit. And I maintain a long list of HELO names,
AND IP ranges, AND sending hostnames, AND senders domains, plus all
the filtering I do after accepting the mail... Wacky. If we just
renamed 'spam' to 'justifiable homicide'...
--
Matthew Fuller (MF4839) | fu******@over-yonder.net
Systems/Network Administrator | http://www.over-yonder.net/~fullermd/

"The only reason I'm burning my candle at both ends, is because I
haven't figured out how to light the middle yet"

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We could only wish for "justifiabl e homicide". Now there's a law I would
support! :)

Are you guys miltering to drop the messages with those HELO patterns? I'm
nailing 80%+ across all my clients and I may get 20 to 50 spams/day (down from
200+) which is acceptable but I was going to start using some netfilter hooks
(i.e. Linux firewall code) to inspect mail traffic and apply some more patterns.
If you guys are getting 95%+ via miltering then thats definitely the way to go.

--
Keith C. Perry, MS E.E.
Director of Networks & Applications
VCSN, Inc.
http://vcsn.com

_______________ _______________ ______
This email account is being host by:
VCSN, Inc : http://vcsn.com

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Nov 23 '05 #30

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