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after test with few domains, is the recipient that having the issue.
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Hi Expert,<br />
<br />
we are using dedicated server in hosting company, we manage our exchange server,<br />
<br />
recently we have changed the public IP.<br />
<br />
and right now we hit one issue when we send to a domain, <br />
<br />
NDR is <br />
<br />
Cellopoint rejected your message to the following e-mail addresses:<br />
Cellopoint #550 Relaying mail to xxx is not allowed ##<br />
<br />
what should i do now?<br />
thanks
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Hi Expert,

we are using dedicated server in hosting company, we manage our exchange server,

recently we have changed the public IP.

and right now we hit one issue when we send to a domain, 

NDR is 

Cellopoint rejected your message to the following e-mail addresses:
Cellopoint #550 Relaying mail to xxx is not allowed ##

what should i do now?
thanks

Exchange 2010 Cellopoint #550 Relaying mail to xxxis not allowed

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.