Exchange 2010 error Sending to

Recently we started getting NDR's from any address we send to. Started a about 3 days ago. No other issues sending mail. Below is the NDR we get when sending to any address.


Diagnostic information for administrators:

Generating server: #500 5.5.1 Unknown command "XXXX 3859 LAST" specified ##rfc822;

Original message headers:

Received: from ([fe80::85bb:5812:7b16:6258]) by ([::1]) with mapi id 14.01.0218.012; Mon, 17 Sep 2012
 06:05:31 -0400
From: "McGrath, Tim" <>
To: District-Staff <>
Subject: Home directories and shared drives
Thread-Topic: Home directories and shared drives
Thread-Index: Ac2Uu7lFDmjd5eIvS8SwbW42Hpi5vg==
Importance: high
X-Priority: 1
Date: Mon, 17 Sep 2012 10:05:31 +0000
Message-ID: <>
Accept-Language: en-US
Content-Language: en-US
x-originating-ip: []
Content-Type: multipart/alternative;
MIME-Version: 1.0
X-Auto-Response-Suppress: DR, OOF, AutoReply
Who is Participating?
TimMcGrathAuthor Commented:
Figured out the issue. ASA 5010 jacking up smtp inspection.  Disabled esmtp

in config mode:

no inspect esmtp
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