One Email Domain Not Working

[BKer]

I am running Exch 2003 and have all but two domains that emails cannot be sent to. I cannot ping the ip or run a tracert, but I have run ms's smtpdiag tool and i can see the ips of the mailservers the domain uses.

when i do an nslookup it does not resolve the domain name to an ip address, so i am not sure if it is a dns issue.

can someone point me in the right direction on how to resolve such an issue?

i contacted the domains isp, which happens to be ours as well. and they said that the reason we cannot ping them is because the domain has a virtual ip and they are behind a firewall.

thanks in advance for any help provided

brian

 

[sab4you]

I think you wrote the answer with your question.

"I contacted the domains ISP, whcih happens to be ours as well. and they said that the reason we cannot ping them is because the domain has a virtual ip and they are behind a firewall"

If no mail can be sent to the IP address, then that would be why you dont get mail.

The IP address needs to be seen to the internet, then you need a MX record pointing for that domain to that IP address. You also need to open up the ports in the firewall.

 

[BKer]

thanks for the quick response. right after you responded i got a reply from a test email to the domain saying the the message was recieved. i then checked the queue and saw that another message had been in there since this morning and then it was sent.

i replied to the message that went through and now it is waiting in the queue and showing a number of delivery failures. do you think that it is the isp that is messing up? it seems like exchange is randomly making contact to the mailserver and then sending.

what should i say to the isp regarding such an issue?

thanks again.

Brian

 

[sab4you]

before you talk with your ISP, first thing I would do is check your event logs.

hopefully some better tek-tips exchange guru's can chime in as well with other things to check

 

[BKer]

i am about to split my head in two. this has been happening for awhile. for some reason my exchange server can't find the domain controller and seems to think that it is lost in the LAN. this makes active directory and exchange tools inoperable on the server.

i keep getting these errors in eventvwr

MSExchangeSA
MSExchangeDL
MSExchangeDSAccess

eventually exchange craps out and i have to reboot in order for it to work.

does anybody have any idea why this would be?
also have a number of emails sitting in the queue waiting to be sent, but i can't figure out why because i can ping the the domains and dns seems to be working fine.

any help would be appreciated.