> Please show me the header/log of that mail. Is the mail "local"?
It's coming from a different machine, but a.com is in b.com's localDomains.
b.com is a.com's MX, but b.com generates and send out mail on it's own. 

Here are the logs and headers. Notice how the client (and I assume the MTA)
receive a changed Message-Id.

== a.com Sendmail ==
Jan 11 09:59:12 a.com sendmail[28277]: [ID 801593 mail.info] q0BExC5r028275:
to=<[email protected]>, ctladdr=<[email protected]> (80/80), delay=00:00:00, xdelay=00:00:00,
mailer=esmtp, pri=120440, relay=b.com. [2.2.2.2], dsn=2.0.0, stat=Sent
(q0BExCk4006671 Message accepted for delivery)

== b.com ASSP ==
Jan-11-12 09:59:12 Connected: 1.1.1.1:46819 -> 2.2.2.2:25 (listenPort) ->
127.0.0.1:38939 > 127.0.0.1:1025 , 8-9;
Jan-11-12 09:59:12 m-32629-59992 [Local] 1.1.1.1 <[email protected]> to: [email protected] 
local
-- 1.1.1.1 in acceptAllMail -- [TEST ASSP DKIM] ->
/var/db/assp/notspam/32629-59992.eml;
Jan-11-12 09:59:12 m-32629-59992 1.1.1.1 <[email protected]> to: [email protected] finished
message - received DATA size: 1.16 kByte - sent DATA size: 1.18 kByte;
Jan-11-12 09:59:12 Disconnected: 1.1.1.1 ;

== b.com Sendmail ==
Jan 11 09:59:12 b.com sendmail[6671]: [ID 801593 mail.info] q0BExCk4006671:
from=<[email protected]>, size=1177, class=0, nrcpts=1,
msgid=<[email protected]>, proto=ESMTP,
daemon=MTA, relay=localhost [127.0.0.1]
Jan 11 09:59:12 b.com opendkim[2943]: [ID 632817 mail.info] q0BExCk4006671:
s=mail d=a.com SSL error:04077068:rsa routines:RSA_verify:bad signature
Jan 11 09:59:12 b.com sendmail[6671]: [ID 801593 mail.info] q0BExCk4006671:
Milter insert (1): header: Authentication-Results: b.com; dkim=fail
(verification failed)\n\[email protected]
header.b=XXYHiqBB;\n\tdkim-adsp=unknown
Jan 11 09:59:12 b.com opendkim[2943]: [ID 614597 mail.notice]
q0BExCk4006671: bad signature data
Jan 11 09:59:12 b.com sendmail[6672]: [ID 801593 mail.info] q0BExCk4006671:
to=<[email protected]>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31525,
dsn=2.0.0, stat=Sent

== Message header on b.com==
> cat /var/db/assp/notspam/32629-59992.eml
X-Assp-Version: 1.9.1.8(1.1.01) on b.com
X-Assp-Passing: 1.1.1.1 in acceptAllMail
X-Assp-ID: b.com m-32629-59992
Received: from a.com ([1.1.1.1]
        helo=a.com) by b.com with ESMTP (ASSP 1.9);
        11 Jan 2012 09:59:12 -0500
Received: from a.com (localhost [127.0.0.1])
        by a.com (8.14.3/8.14.4) with ESMTP id q0BExC5r028275
        for <[email protected]>; Wed, 11 Jan 2012 09:59:12 -0500 (EST)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed;
        d=a.com; s=mail; t=1326293952;
        bh=TN5zhHpQDDJUEfM5DIhYE0frhYE=;
        h=Date:From:Message-Id:Subject:MIME-Version:Content-Type;
        b=XXYHiqBB2dN+NJ2VK1QtqdiBtAYwChmnz4nQMsQ2JSLb8xJetAJMHCXNInNbz38MS
         ru5linEgHbSTP91xPqv5mLTfsjRignb/D6INq8CQvG8nwF9f5mbMjcIPgtbJI2H
Received: (from a@localhost)
        by a.com (8.14.3/8.14.4/Submit) id q0BExC73028274
        for [email protected]; Wed, 11 Jan 2012 09:59:12 -0500 (EST)
Date: Wed, 11 Jan 2012 09:59:12 -0500 (EST)
From: a <[email protected]>
Message-Id: <[email protected]>
Subject: TEST ASSP DKIM
MIME-Version: 1.0
Content-Type: text/plain

== Message header received by client ==
Received: from a.com (localhost [127.0.0.1])
        by b.com (8.14.4/8.14.4) with ESMTP id q0BExCk4006671
        for <[email protected]>; Wed, 11 Jan 2012 09:59:12 -0500 (EST)
Authentication-Results: b.com; dkim=fail (verification failed)
        [email protected] header.b=XXYHiqBB;
        dkim-adsp=unknown
Received: from a.com ([1.1.1.1]
        helo=a.com) by b.com with ESMTP (ASSP 1.9);
        11 Jan 2012 09:59:12 -0500
Received: from a.com (localhost [127.0.0.1])
        by a.com (8.14.3/8.14.4) with ESMTP id q0BExC5r028275
        for <[email protected]>; Wed, 11 Jan 2012 09:59:12 -0500 (EST)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed;
        d=a.com; s=mail; t=1326293952;
        bh=TN5zhHpQDDJUEfM5DIhYE0frhYE=;
        h=Date:From:Message-Id:Subject:MIME-Version:Content-Type;
        b=XXYHiqBB2dN+NJ2VK1QtqdiBtAYwChmnz4nQMsQ2JSLb8xJetAJMHCXNInNbz38MS
         ru5linEgHbSTP91xPqv5mLTfsjRignb/D6INq8CQvG8nwF9f5mbMjcIPgtbJI2H
Received: (from a@localhost)
        by a.com (8.14.3/8.14.4/Submit) id q0BExC73028274
        for [email protected]; Wed, 11 Jan 2012 09:59:12 -0500 (EST)
Date: Wed, 11 Jan 2012 09:59:12 -0500 (EST)
From: a <[email protected]>
Message-Id: <[email protected]>
Subject: TEST ASSP DKIM
MIME-Version: 1.0
Content-Type: text/plain
Content-Length: 5
Status:   



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