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Alert - Trend Micro Interscan Messaging Hosted Security
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Extreme
Leg Humper
Leg Humper


Joined: 17 Jun 2001
Age: 29
Posts: 4560
Location: Palm Bay, Florida USA
Post Posted: Wed Aug 26, 2009 2:02 pm   Post subject: Alert - Trend Micro Interscan Messaging Hosted Security Reply with quote Back to top  
Do you use the Trend Micro Interscan Messaging Hosted Security product? If so, some domains may be blocking your e-mail (I.E. 1and1.com clients).

To correct the issue, you will need to update your MX record to in.mx.trendmicro-fail-over.akadns.net

The issue is Trend Micro is following some new RFC that allows CNAMES for MX Records. 1and1.com (And others I would assume) perform a lookup on your MX Record when it scans inbound mail and see that the MX Record is a CNAME, not an IP Address as they expect per the RFC they are following so they reject the inbound SMTP Connection.

Just figured I would give a heads up just in case.

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Slymer
Big Dog
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Joined: 29 May 2003
Age: 32
Posts: 3310
Location: chair in front of my computer
Post Posted: Wed Aug 26, 2009 2:38 pm   Post subject: Reply with quote Back to top  
heh... fun! *sarcasm*

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