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?
garryshapeAsked:
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d0ughb0yConnect With a Mentor President / CEOCommented:
Sounds like their servers are configured to only send out encrypted emails, but yours might not be. So their server, when discovering that your server won't handle the TLS connection, blocks them from sending to you. Could be that it's a default with their server. Could be that it's with their individual clients.
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PakaConnect With a Mentor Commented:
Probably the gov end.  Here's a good tool to check whether TLS is working properly:
http://www.checktls.com/
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garryshapeAuthor Commented:
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
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