Been having troubles lately with our Exchange 2007 server, we're getting a higher than normal volume of bounces, delays, or undeliverable email, both incoming and outgoing. The odd thing is it's never consistent, some domains get our mail and can send mail to us, sometimes there is a delay notification and will eventually go through, sometimes they'll get a delay notification and it will go undeliverable.
I've run every test in exchange mail route and it hints to a DNS problem obviously but the messed up thing is i can't find a single thing wrong with anything.
I've checked and refreshed our domain root hints, I've run with domain pointers through verizon dns and googles public dns, integra's dns who is our T1 provider, nothing is stuck in the queue.
I've called Integra to make sure there was no problems between us and them, our adtran is working fine, our router is functioning properly, websites are resolving correctly.
The only semi consistant domain i can test off of is sbcglobal.net which at this time we only can email to and receive about 10% of the time.
I've run numerous mxlookups and we're not on any blacklists, nslookups to other domains all resovle and i can connect to all of the affected domains through telnet.
our domain is hysecurity.com
The following is the delay notification we're receiving.
Delivery is delayed to these recipients or distribution lists:
This message has not yet been delivered. Microsoft Exchange will continue to try delivering the message on your behalf.
Delivery of this message will be attempted until 11/11/2010 12:23:47 PM (GMT-08:00) Pacific Time (US & Canada). Microsoft Exchange will notify you if the message can't be delivered by that time.
The header info for that email is as follows:
Received: from HSK.HySecurity.local ([10.0.0.12]) by HSK.HySecurity.local
([10.0.0.12]) with mapi; Wed, 10 Nov 2010 07:08:18 -0800
Content-Type: application/ms-tnef; name="winmail.dat"
From: Nick <email@example.com>
To: Bruce <firstname.lastname@example.org>
Date: Wed, 10 Nov 2010 07:08:16 -0800
Subject: FW: Test
Any, ANY ideas would be greatly appreciated!