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Messages Not Coming In from Gmail and Hotmail into Exchange

Multiple senders are receiving this error when sending to our server:

Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 530 530 authentication required for relay (#5.7.1) (state 13).

Our environment:
Exchange 2003
Postini on all inbound mail
Antigen for inbound and outbound
Comcast business class for Internet access
AT&T owns the DNS record.

Recent change - switched from AT&T DSL to Comcast.

Updated MX record with new IP address of router.

Only Hotmail and GMAIL have this problem.

As a test, I opened up Postini for ALL Gmail email and Hotmail, but it didn't fix the the problem.

Any help is greatly appreciated.
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tedwill
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tedwill
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1 Solution
 
Jarred PowerNetwork AdministratorCommented:
How long ago did you do the switch?  Could take while for the MX record to propgrate to their servers.  It should state the generating server for the error.  
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tedwillAuthor Commented:
It's been a few weeks.  I updated the MX record and the flowed just fine for a few weeks until this happened over the last few days.  The "relay" part of the error message has me the most perplexed.  
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Jarred PowerNetwork AdministratorCommented:
I believe this is a SMTP error - See http://support.microsoft.com/kb/895853

Add the smtp domain into the virtual smtp server.
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tedwillAuthor Commented:
Thanks.  It was option 2, "allow authenticated computers to relay"
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