This is a MailScanner issue it happens when MailScanner times out SpamAssassin and kills it.
Unfortunately by default Mailscanner gives SA 30 seconds to run, and SpamAssassin gives a 30 second timeout to DNS blacklist lookups. Hence, anytime a DNSBL becomes unavailable, by default SA will get killed by MS.

Either decrease SpamAssassin's DNS blacklist timeout, or increase MailScanner's SpamAssassin timeout.

I changed SpamAssassin's timeout for DNSBLs editing MailScanner's spam.assassin.user.prefs to include:

#the following reduces the time for a run of SA
#but risks timing out valid blacklist data or falsely claiming no mx for from.
#it is still better to timeout a blacklist than
#to have mailscanner timeout SA and skip it entirely
check_mx_attempts 2
check_mx_delay 3
rbl_timeout 10
razor_timeout 10

I changed MailScanner's maximum SA run time by editing mailscanner.conf:
SpamAssassin Timeout = 40


At 10:59 AM 10/24/2002 -0400, Stephen Groundwater wrote:
I've been seeing a lot of messages slip into our system which have no SA
score assigned.
X-MailScanner-SpamCheck: not spam, SpamAssassin ()

Can someone shed light on how these are getting through? Enclosed is a
sample header.
I'd also be curious if others have seen this problem.
(I did try looking for answers in the mail archive, maybe I missed
something)

Thanks in advance.
Steve G

CLIP
-----------
Received: from webshield([10.1.1.21])
by pa-gwpri2.klehr.com; Sat, 19 Oct 2002 19:05:13 -0400
Received: FROM spambuster.klehr.com BY webshield ; Sat Oct 19 18:59:17
2002 -0400
Received: from servidor.altran.com.br
(IDENT:[EMAIL PROTECTED] [200.207.42.122])
by spambuster.klehr.com (8.11.6/8.11.6) with ESMTP id g9JN2dF27186;
Sat, 19 Oct 2002 19:02:39 -0400
Received: from lycoseumailbox.caramail.com
(ppp-63-198-17-135.dialup.chic01.pacbell.net [63.198.17.135])
by servidor.altran.com.br (8.9.3/8.8.7) with ESMTP id VAA04267;
Sat, 19 Oct 2002 21:10:14 -0200
Message-ID:
<0000177f3d23$00002cfb$[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
From: "Jimmy Asher" <[EMAIL PROTECTED]>
Subject: i need to talk to you about your septic tank
VHDQXB
Date: Sat, 19 Oct 2002 15:53:16 -1900
MIME-Version: 1.0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Reply-To: [EMAIL PROTECTED]
X-MailScanner: Found to be clean
X-MailScanner-SpamCheck-SPAMBUSTER: not spam, SpamAssassin ()


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