ISP DNS and Local DNS -mail

cur
cur used Ask the Experts™
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some times we are getting some complain on few domins emails are not going .

how can i check the ISP  DNS server name resolving working fine . some of the email are not going to deliver . from my internel mail server name  and ISP needs to be check myself .

I hope only way is nslookup  ?

can you give me the way I can check this from the my exchnage server and then ISP level .

we have this issue on and off . but need to check this properly . when i spoke to the ISP  replay is problem is in our end . after few hours issue was gone ?

that is why i want to go on one end to the ISp


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Commented:
Hi,

One of the tests you can do is ask the person having issues to open a Command Prompt window and try to telnet the hostname of your mail server.

If they can't get a prompt/banner and connect you have something to start working with.

Thanks,
Noam
Commented:
Hello,

Check your internal DNS server & please check the forwarders.
Reverse lookup zone having problem.

Regards,
Tushar Kaskhedikar
cur

Author

Commented:
there all ok . mail are working fine wxcept few domains


just i want to check the name resolving part ?
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Commented:
what happens on those few domains?
cur

Author

Commented:
that is why i need to check the name resolving worning or not ?


to do that what setps i can follow
Commented:
You didn't answer how do you know that a few domains don't work?
Commented:
you need to do an nslookup for the mx records of the domains your getting errors on or your not reaching them, and you have to make sure that your domain is not on the blacklist for those domains.
cur

Author

Commented:
another ISp tech came and did the test from the mailserver and mentioned that our current ISP cant resolve that given two domians .
later used their dns to resole that . it works .

i want to do the same test for other domanis as well
Commented:
Hi,

If you are having DNS resolving issues, try using the DNS of Google 8.8.8.8, and see if it resolves your issue.

If it does, then the DNS you are using is badly configured and is not properly resolving domains for you.

You will need to contact the DNS's administrator.

Thanks,
Noam
cur

Author

Commented:
sorry noam . i am talking about the ISP dns . our one is working fine

Commented:
Hi,

So the mail server having issues is the ISP mail server?

Or is it yours?

If it is yours, and you have your own DNS, why are you concerned with the ISP's DNS?

Thanks,
Noam
cur

Author

Commented:
not my one .i have inform isp about few domain names and they manage to fix few . still few are in the working level  . what is issue look to you
cur

Author

Commented:
good

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