I have a 5 month old sbs 2011 (exchange 2010) machine that has been sending email fine for months. All of a sudden users at work are getting NDR's from exchnage. Nothing has changed. Here is the NDR. Not all emails are rejected.
Delivery has failed to these recipients or groups:
The server has tried to deliver this message, without success, and has stopped trying. Please try sending this message again. If the problem continues, contact your helpdesk.
Diagnostic information for administrators:
Generating server: Server.Domain.local
#550 4.4.7 QUEUE.Expired; message expired ##
Original message headers:
Received: from Server.Domain.local ([null]) by
Server.Domain.local (null) with mapi id
14.03.0174.001; Mon, 24 Mar 2014 08:55:03 -0700
From: user <email@example.com>
To: "firstname.lastname@example.org" <email@example.com>
Subject: RE: Video
Date: Mon, 24 Mar 2014 15:55:02 +0000
Message-ID: <C937637EEABD7049A9FBE33A292E3F59235E5F0C@ SBS.server.local>