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Exchange 2010 Cellopoint #550 Relaying mail to xxxis not allowed

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?

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8/22/2022 - Mon