Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

we setup a mail server in our local office using Mdaemon Mail Server . We have a Staic ip 123.xxx.123.xxx ( as an example ) and all necessary ports (80 , 25 , 110 ) are made open .

We have a domain abc.com which is not hosted anywhere planning host at our server only after our mail server issue solved ( at port 80 - apache http server ). We have DNS settings made at one of free DNS service provider ( zonomi.com ).

In Zonomi - ( dns service provider) our domain abc.com has following dns records .

  1. IP Addresses (A)

abc.com points to 123.xxx.123.xxx

mail.abc.com points to 123.xxx.123.xxx


Mail Servers (MX)

mail.abc.com -> abc.com

Name Servers (NS)

ns1.zonomi.com handles DNS for abc.com

ns2.zonomi.com handles DNS forabc.com

after finishing this settings we tried running our mail server but most mails were blocked at gmail , yahoo etc . then we come to know our rdns( reverse dns / ptr not matching )

current static ip 123.xxx.123.xxx rdns check points to 123.xxx.123.xxx.vsnl.net(our ISP - vsnl ) ....

where as our forward dns look up shows

                  123.xxx.123.xxx   - abc.com ( or mail.abc.com ?)

Now we finaly decided to ask our ISP to do necessary change in to our PTR / rDNS setting to point our domain(abc.com or mail.abc.com ) so my question is

what are details i should need to give to my ISP to do Necessary settings on rDNS at its end

ex like domain name , ns records details etc ?

and one more thing

we set up A record abc.com to 123.xxx.123.xxx & mail.abc.com also to 123.xxx.123.xxx and my mx records mail.bac.com to handle abc.com mails

so I want to know what is exact rDNS value abc.com or mail.abc.com should be point against our static IP 123.xxx.123.xxx

what should i tell to my ISP to put in rdns value abc.com or mail.abc.com ????

share|improve this question

1 Answer 1

  • If you have domain already registered, you can write real domain - it's safe (and easier debug for possible errors)
  • mail RR is or copy-paste error or definition error (missed dot?), check it
  • you can ask to write any of two hostnames in reverse zone, both (for shown settings) will work - you have only pass "Paranoid IP check" for hostname (IN A -> IN PTR requests pair) must generate closed ring

PS: you can ever use default hostname of ISP for MX record of your domain and don't ask ISP do something - MX records of any domain can be anywhere outside domain's name-space

share|improve this answer
    
MX entry is a mistype as you pointed . i correctd now , any way thanks for your jelp .. i ask my ISP what you suggeseted . –  panindra Feb 1 '12 at 15:22

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.