I want to installing two or more qmail on same linux server.Is this possible? If it's possible how can I do that?

Actually I want to send mails from the different domain names and different IP addresses.For instance;

xxx@a.com > 11.11.11.11
xxx@b.com > 22.22.22.22
xxx@c.com > 33.33.33.33

If it's not possible, what's your recommendation?

Thanks,

Sign yourself into a home for the bewildered :-)).

Seriously, you can probably do it but I imagine qmail can handle more than one domain. I messed with it about 10 years back, and it messed with me more than I messed with it. Then I discovered http://www.lifewithqmail.org

Linuxfromscratch do/used to do a thing on compiling it with options which allowed you to move it to sensible places. But it uses variables, groups and lusers so it's a job of work(Patching) to put 2 different installations in.

Are you not able to use numerous domains on the one server?