Nataraj:
> I am extensively familiar with my main.cf file and am aware of exactly
> what changes have been made. This mail server has been running stably
> for years and I am not yet aware of changes to the mail configuration
> files surrounding the time when this problem came up.
>
> There are quite a number of mailserver packages out their that use
> postfix as the MTA. I'm extensively familiar with the architectures of
> both the postfix and vpostmaster systems and I assure you that there is
> no front end. The port 25 service on my mailserver is the postfix
> smtpd. Vpostmaster, is simply a policy and transport agent with spam
> management and a web based GUI for management. It's quite nice and I
> highly recommend it to people.
If the Postfix SMTP server hangs after 10s and no such smtpd_timeout
is in main.cf, then either the smtpd_timeout value is taken from
master.cf, or it is taken from a different main.cf file.
It is worthwhile at this point to do
find / -name main.cf -ls
and see what shows up.
Wietse