SMTP stopped working

[rbertram]

The SMTP services were working fine for weeks and a few days ago it just stopped.

I tested the MX records and had no problems resolving domain names through the DNS server.

The messages get stuck in the queue. I tried restarting the SMTP service, restarting the SMTP virtual server, even disabling the virtual server and recreating a new one. Nothing is working.

The only changes to the server recently have been the last two security updates from MS which involved a reboot.

The only thing the SMTP service is for is to allow the owner of my company to send his personal e-mail. His ISP only allows mail to originate from his personal IP address. Otherwise all other messages go through our various web host's SMTP servers.

So I have had to resort to establishing a VPN connection to my win2k server at home and dropping the messeages into the pickup folder on my server at home to send them.

 

[epohl]

What kind of errors do you see relating to smtp in the event viewer?

 

[rbertram]

"Message delivery to the remote domain your.domain.com failed. An internal DNS error caused a failure to find the remote server. 0000: c00402e7"

According to the MS website I need to add a second Domain Name System (DNS) packet filter for the outbound TCP port 53. How would I do this?

 

[epohl]

Does this machine have multiple IP Addresses? If so this article will probably help you.

http://support.microsoft.com/default.aspx?scid=kb;en-us;249104

 

[rbertram]

Thanks for the suggestions, but it started working again on its own after rebooting the server after performing some scheduled maintanence. Must have been some weird MS error problem after the last reboot.