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[haniis]

Hello,
Some users in our organization Complains that they can not send some emails to some external e-mails. they recive
The following organization rejected your message:
after I searched intenet I found that our dns when I do nslookup from out side the organization can not resolve the reverse record.
from IP to FQDN.
but from inside the organization the reverse record it works fine . even I do the reverse record in our public dns.
any help.

 

[alfa2008]

Contact your ISP, they have to set up reverse DNS for you.

 

[haniis]

I have the dns we are an ISP, and I did the reverse dns.

 

[alfa2008]

Check from external internet account: nslookup YourPublicIP, and see what is showing. If doesn't show you external address of mail server, example: mail.domain.com, then be sure reverse DNS is configured properly.