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Garry ShapeFlag for United States of America

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Email - must use TLS - deny

Some user's on another domain (.gov domain) are getting these replies back when trying to e-mail some users on our own domain (non-government domain).

The messages will read like this to them:


The message or an attachment did not reach the intended recipient(s).!
  Subject:
     From: user@domain.gov
       To: user@ourdomain.com
     Date: Wed, 22 May 2013 02:19:33 -0600
   Reason: domain.gov must use TLS
   Action: deny


Is this usually something can be fixed on the exchange end of our domain or something going on with the government domain email server?
SOLUTION
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Paka

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Thanks guys, should be able to correct based on this info, but unfortunately I have to work with third-party McAfee via e-mail for the rest.

Thanks