a personal question because I'm having kinda same problem. Do you have a DMZ? Do you have internal dns and public dns?
I have a problem like yours but only from my internal net. Clients from the "outer world" dont have any problem, inside hosts have timeouts.
Nasib Salim wrote:
I'm running Qmail with vpopmail and qmail-scanner. For the past 2 years there were no problem but recently the problem starts.
SMTP Server is too slow to respond. it takes more than a minute for it to response. My DNS is working fine and there is no problem even resolving the mail server. I know the DNS is the source is this problem but seems its not.
Nasib A Salim Mediapost (T) Ltd