E-mail issue RCP host

Hello,

Today I had a exchange server all the sudden that stopped sending and receiving e-mail and nothing has changed on it. When I attempt to send e-mails to it I am getting the following NDR message:

staff@domain.com
    SMTP error from remote mail server after RCPT TO:<staff@ldomain>:
    host mail.domain.com [IP Address]:
    553 sorry, that domain isn't in my list of allowed rcpthosts; no valid cert for gatewaying (#5.7.1)

I have checked the server to be on a blacklist and it appears not to be on a black list. I have also rebooted the server and verified that DNS is working correctly also ran a virus scan on the system and nothing was found. Any suggestions?
aandoAsked:
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TyBeattyCommented:
What version of Exhange?
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TyBeattyCommented:
If it is Exchange 2007 have a look at the accepted domains on the Hub transprt tab and make sure the domain did not get removed somehow.

This will cause the error you are seeing.
Accepted-Doms.JPG
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aandoAuthor Commented:
Come to find out it is a issue at the hosting with gmail apps.
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TyBeattyCommented:
Oh very good.  Well then GMail can fix their broke stuff!!   lol

The place I showed you is the only place you would find that in Exchange so I figured it was that or nothing..  lol
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