Mail server for multiple domains? [closed]

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I have server, bought from Linode. I decided to setup a mail server on it. I have about 20 domains will be pointing it.

I have a couple of questions;

1. This is the combination i will use; postfix + dovecot + squirrelmail. Are there better alternatives? I am completely open for recommadations because this is the first time i will setup a mail server.

2. Is it possible to use multiple domains with one mail server?

3. If it is possible to work with multiple domains, is it require a complicated and painful configuration?

Note: I can't use Google Apps because 40 EUR for per mail address is very expensive when you have a hundred mail address.

Answer 1

You have to have at least a basic understanding of how DNS works. It can be kind of a pain, but if you use one of the postfix plugins for management, should be fine. But yes, multi-domains on the same server is fine, it just has to know that it is representing those host hame records, and your DNS for your domains needs to be configured to have the MX records point at your server's IP.