I know it sounds unlikely, but it really seems to happen.  Here's
an example.  First, some of the header/envelope info from an
email that got through SA (recipient address and domain altered):

Received: from mail1.somecompany.com ([127.0.0.1]) by localhost
(mail1.somecompany.com [127.0.0.1]) (amavisd-new) with ESMTP id
05169-04 for <[EMAIL PROTECTED]>; Wed, 25 Sep 2002
14:27:25 -0000 (CDT)
Received: from mail.your-info.cc (unknown [65.244.188.58]) with
ESMTP id 05169-04 for <[EMAIL PROTECTED]>; Wed 25 Sep 2002
14:27:25 -0000 (CDT)
Message-ID: <[EMAIL PROTECTED]>
X-Mailer: Mozilla 4.76 [en] (X11; U; SunOS 5.8 sun4u)
From: [EMAIL PROTECTED]
Content-Type: text/html
Mime-Version: 1.0
X-Virus-Scanned: by amavisd-new amavisd-new-20020630

In the logs, I trace this email and see:

Sep 25 14:27:25 mail1 amavis[5169]: (05169-04) spam_scan:
whitelisted sender  <[EMAIL PROTECTED]>, spam check skipped
Sep 25 14:27:25 mail1 amavis[5169]: (05169-04) spam_scan:
tests=whitelisted,  <[EMAIL PROTECTED]>
Sep 25 14:27:25 mail1 amavis[5169]: (05169-04) fwd via smtp:
[127.0.0.1:11028] <[EMAIL PROTECTED]> -> <[EMAIL PROTECTED]>
Sep 25 14:27:26 mail1 amavis[5169]: (05169-04) mail checking
ended: DELIVERED

Now I've never whitelisted this "your-info.net" sender.  I'm
running SA with postfix.  And if I: 

grep -i your-info.net /etc/postfix/*
grep -i your-info.net /etc/mail/spamassassin/*
grep -i your-info.net /usr/share/spamassassin/*
grep -i your-info.net /root/.spamassassin/*

I come up with no instances of this string.  This mail server
doesn't hold any local mailboxes, it is just a relay to our
internal mail server, which is Exchange, and the users run
Outlook and don't have any ability to whitelist anything
themselves, so it can't be a user whitelist issue.  This is only
one example.  It looks to me like some senders are sending in
emails that get themselves whitelisted somehow!  Could there be
some exploit of SA that could do this?



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