Hi,

Our mail server is running red hat 5.1 and qmail. It has 2 network cards in it to form two separate networks, both requiring mail. As of yesterday all the users on one of the network interfaces can no longer send email, they can however receive. All users on the other interface are unaffected and can do as they please.

I am a linux/unix newbie so am not realy sure what to do, can anyone suggest anything? I have rebooted it to no avail. I have also ruled out the cabling and connecting switches (3com) by connecting a machine direct and attempting to telnet to port 25, which doesn't work.

Nothing has changed anywhere else on the network. I guess I just need to get port 25 back on the second ethernet card, although I don't understand why it has disappeared. It's quite an old machine with 95% disk usage.

Any advice, no matter how simple, is greatly received.

Cheers.