I am the IT admin for a company that uses Postini spam filtering service. We received reports from someone that they weren't able to email us, and it was from an @msn.com email address. It's not the first time, and I assumed it was something they were doing wrong. Then I tried it from a personal @hotmail.com account of my own and all my attempted messages came back as rejected. Oddly, I have a second personal @hotmail.com account and using that to send to a corporate address went through fine. This appears to be restricted to certain Windows Live mail accounts. The error message is less than helpful too and only says:
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
*** Email address is removed for privacy ***
Looking at the logs in Postini I don't see any of these failed messages having ever reached the mail server, which leads me to believe this is a problem within the Windows Live mail system that is preventing the messages from even attempting to communicate with our servers. Any idea why messages from @hotmail.com and @msn.com accounts are not getting through to Postini? I can receive messages from our corporate account to these Windows Live accounts, but cannot send anything back from the Windows Live account. I've tried forwarding, replying, and creating new, but all are coming back with the error message.
Looking at the attachment I get from the error email, it looks like the problem is that the Windows Live mail server is getting a relay access denied error (5.7.1) when trying to push the email through. The exact error in the attachment is:
Reporting-MTA: dns;snt0-omc2-s49.snt0.hotmail.com
Received-From-MTA: dns;SNT113-W16
Arrival-Date: Wed, 20 Jun 2012 09:31:27 -0700
Final-Recipient: rfc822;*** Email address is removed for privacy ***
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;554 5.7.1 <*** Email address is removed for privacy ***>: Relay access denied
I've received questions from a few new outside sources trying to send message to our company from @msn.com email addresses now. All I've been able to tell them is that if they need to use any other email accounts they may have outside of @msn.com, @hotmail.com, or @live.com.
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