hi, I need some help on setting of qmail.

I have linux and qmail as mail server, present there's an domain running on that, if I want to add another doamin on the mail server, need I install another qmail?, and how to set that?

thanks.

Just add the additional domain(s) to the rcpthosts file, and set up the appropriate .qmail files.

flounder.net/qmail/qmail-howto.html#16

The files which have to be modified depend on the mail construction which you are going to use.

If you have only 1 IP subnet for the 2 mail domains:

/var/qmail/control/rcpthost - should contain both email domains
/var/qmail/control/defaultdomain - should contain you're main mail domain
/var/qmial/control/plusdomain - should contain the 2nd mail domain

If the clients 4 the 2nd domain are in a different subnet you should also edit the /etc/tcp.smtp file so that the second subnet may relay mail trough your linux server.

Hoped it helped