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Exchange server is rejecting messages from msn and hotmail
I have an SBS 2003 server running Exchange 2003 SP2. Several days ago we started receiving reports that some users (so far only hotmail and msn that I know of) are unable to send email to our domain. They get a bounced message like the following:
Reporting-MTA: dns;bay0-omc2-s32.bay0.hot
Received-From-MTA: dns;BAY101-W52
Arrival-Date: Thu, 19 Feb 2009 20:15:42 -0800
Final-Recipient: rfc822;administrator@denve
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 <administrator@denverspine
I have tried sending from hotmail as well and get this exact message. Nothing has changed recently in our Exchange configuration. Any ideas?
Reporting-MTA: dns;bay0-omc2-s32.bay0.hot
Received-From-MTA: dns;BAY101-W52
Arrival-Date: Thu, 19 Feb 2009 20:15:42 -0800
Final-Recipient: rfc822;administrator@denve
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 <administrator@denverspine
I have tried sending from hotmail as well and get this exact message. Nothing has changed recently in our Exchange configuration. Any ideas?
ASKER
Thanks, Mestha.
MXLogic is our spam filter. Our MX records point to their server, then it's delivered to our Exchange server. My understanding is, however, than when MXLogic blocks a message it doesn't send any kind of NDR to the sender. I will check with them, though.
MXLogic is our spam filter. Our MX records point to their server, then it's delivered to our Exchange server. My understanding is, however, than when MXLogic blocks a message it doesn't send any kind of NDR to the sender. I will check with them, though.
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ASKER
MXLogic assures me that this is not their doing. I may change the MX records to send mail direclty to us to be sure.
This exact problem is happening to our domain as well. Started a few weeks ago. Attached is my NDR received after a test message. So far no help from MSN/Hotmail and only a few other reports I can find of this happening to others. We use Appriver for spam filtering. They say there's no record of the emails ever being sent, so they're not getting caught as spam (and even if they were, they would not bounce). BTW, testaccount101 is no longer valid, but was at the time and received mails from other senders.
Reporting-MTA: dns;bay0-omc2-s18.bay0.hot
Received-From-MTA: dns;BAY106-W13
Arrival-Date: Thu, 5 Mar 2009 17:40:38 -0800
Final-Recipient: rfc822;testaccount101@dalb
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 Unable to relay for testaccount101@dalbycpa.co
Reporting-MTA: dns;bay0-omc2-s18.bay0.hot
Received-From-MTA: dns;BAY106-W13
Arrival-Date: Thu, 5 Mar 2009 17:40:38 -0800
Final-Recipient: rfc822;testaccount101@dalb
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 Unable to relay for testaccount101@dalbycpa.co
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ASKER
The issue has been resolved by me.
This exact behavior suddenly started three days ago at one of my clients--inbound messages from hotmail/msn getting rejected with "Proper authentication required". Then just this morning, an msn subscriber who sends to both that client and to me told me that her message to ME got rejected. Both the client and I have Exchange 2003 SP2...and both of us have DNS at the same vendor.
I'd prefer not to move DNS. Any chance that, since this issue was posted in 2009, someone has determined exactly what the underlying cause is?
I'd prefer not to move DNS. Any chance that, since this issue was posted in 2009, someone has determined exactly what the underlying cause is?
That domain appears to have its email with MXLOGIC. Are you sure that it is Exchange that is rejecting the email and not MXLOGIC ?
-M