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postini rejected mail, but why?

phrea84
phrea84 asked
on
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Last Modified: 2012-05-11
Hi

We are running SBS 2011.  It's been in production for 2 months and things are good.  Today we discovered we can't send to a particular domain.  I was able to determine they are using postini for spam-filtering, but can't figure out why we are blocked.  What's more, the bounce back makes no sense--it shows OUR email address as intended reciepient.  See below

Postini rejected your message to the following e-mail addresses:
THEM@theirdomain.com

Postini gave this error:
Verification failed for <ME@mydomain.com> The mail server could not deliver mail to ME@mydomain.com. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries. Sender verify failed

A problem occurred during the delivery of this message to this e-mail address. Try sending this message again. If the problem continues, please contact your helpdesk.

Diagnostic information for administrators:
Generating server: exchange.domain.local
THEM@theirdomain.com
Postini #550-Verification failed for <ME@mydomain.com> 550-The mail server could not deliver mail to ME@mydomain.com. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries. 550 Sender verify failed ##

2 questions--why is this happening and how do I fix?  I tried routing through our ISP and it bounces as well.  a check on our domain at mxtoolbox.com comes back good on both smtp and RBL

Please help.
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