DNS problems? 2

[Caustic]

On any given day I seem to have a handful of e-mails sitting in my IMC "outbound messages awaiting delivery" with the error [host unreachable]. One such example today is rolandbryant.com. Accorindg to NS lookup: MX=mail.rolandbryant.com. After weeks these hosts are still not getting mail outbound from our location. My site is not blacklisted.

I can ping the name: mail.rolandbryant.com and it will resolve the IP address of 216.248.7.26 but I get a request timed out error.

Any ideas on troubleshooting this? Do others get the same resolved IP address of 216.248.7.26? Thanks.

 

[isguyatlanta]

To test smtp servers telnet to port 25... here's what i got:

421 SMTP service not available, closing transmission channel

This means there is no SMTP service listening at 216.248.7.26 - i did my own nslookup to verify that i was resolving the same address as you.

 

[Caustic]

cool. so, at least in this case, it's not me it's them. Thanks.

 

[ricor]

Now you can telnet into port 25 of 216.248.7.26... is the problem fixed?

I've run into problem similar to this. I've got a client who I can do a nslookup on their domain, but I get no MX record if I do a set q=MX. I can telnet to port 25 of the IP that kicks back from the nslookup, so this is their SMTP server... but Exchange still NDR's to them. I can use my Exchange Server's POP Server to send to them... but have NDRs from Outlook.