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Failed outgoing emails to one domain.  554 No relaying allowed

GFCU
GFCU asked
on
Medium Priority
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Last Modified: 2012-05-06
From my own domain/LAN (Exchange 2003)...
When trying to send an outgoing email to one certain domain it fails and we receive this error message back:

Your message could not be sent.
A transcript of the attempts to send the message follows.
The number of attempts made: 1
Addressed To: user@outgoingdomain.com

Wed, 11 Feb 2009 09:17:09 -0500
Failed to send to identified host,
user@outgoingdomain.com: [outgoingdomain.com.s5a1.psmtp.com], 554 No relaying allowed - psmtp
--- Message non-deliverable.


Any thoughts?  

Also, I'm not blacklisted.  I checked that on mxtoolbox.com.
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Expert of the Quarter 2009
Expert of the Year 2009

Commented:
That is an error from Postini, a spam filtering service. Almost certainly this is a problem outside your control.

-M

Author

Commented:
Okay,

I spoke with the organization and they had me provide to them the error (from the email that got kicked back) and the MIME info.  They had to send that info to their ISP because their ISP is running that postini service.  The ISP has just recently changed the IP address of that postini server.  The ISP immediately told us that my DNS has to be cleared on my end in order for my server to see that new ip address of the new postini server.  How do I clear this DNS????
Expert of the Quarter 2009
Expert of the Year 2009

Commented:
On the server itself run

ipconfig /flushdns

-M
Commented:
this issue cleared up after a couple of days.

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