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Last Error: 450 Client host rejected: cannot find your hostname, []

F_A_H_D asked
Last Modified: 2012-05-12
hi all

i cannot send out to some domains when im opening the message details in queue viewer in my exchange 2010 i can see the error
 Last Error: 450 Client host rejected: cannot find your hostname, [xxx.xxx.xxx.xxx]

the internal mail server name is different than the DNS record i configured in NetworkSolution
on network solution is mail.domain.com
and in the actual server name is servername.domain.com

i configured my internal DNS to have MX record for mail.domain.com and it points to ip of servername.domain.com

to save your time i connected to PC out of the network and with different ISP and i run the following

C:\Users\Administrator>nslookup mail.domain.com
Server:  localhost

Non-authoritative answer:
Name:    mail.domain.com
Address:  xxx.xxx.xxx.xxx

C:\Users\Administrator>nslookup xxx.xxx.xxx.xxx
Server:  localhost

Name:    servername.domain.com
Address:  xxx.xxx.xxx.xxx

is the problem because of the revers ?????????

or what ??
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