How do I set up reverse DNS?

kozdo
kozdo used Ask the Experts™
on
Hi, i would like to know how should be set up our reverse DNS. We have 2 different servers.
1 is netax.cz and 1 is ntbox-01.netax.cz. And we host a couple of domains. When I diagnose for example mail.netax.com - it points to netax.cz and everything is OK. But when I diagnose for example mail.ntbox.cz, this goes to ntbox-01.netax.cz and there are couple of issues -

1. May be an open relay.
2. Reverse DNS FAILED! This is a problem.
3. Warning - Reverse DNS does not match SMTP Banner

Please how can I solve all these issues? Do I have to set up only the ntbox-01.netax.cz or do I have to setup all the other domains which we host at ntbox-01.netax.cz?

Once reverse DNS will be ok for the ntbox-01.netax.cz, will it be ok also for all the domains that have hosting at it?

Thank you..
Comment
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
you have to create a revirce PTR record and register it with the name ntbox-01.netax.cz .

Author

Commented:
Ah, ok, and where can i create it?
in your ISP , you have to call them to do that.
Announcing the Winners!

The results are in for the 15th Annual Expert Awards! Congratulations to the winners, and thank you to everyone who participated in the nominations. We are so grateful for the valuable contributions experts make on a daily basis. Click to read more about this year’s recipients!

Author

Commented:
ok, thank you, and what about the open relay? How can I close it?

Author

Commented:
ok, i`ve checked it at spamhelp.org and it shows that the SMTP server is NOT an open relay. So hopefully that`s ok..

ok, thank you for your help..

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial