UBUNTU mail server

[psicloone]

I`ve installed LAMPP.
I want to be able to send my users email with their forgotten passwords. How do I have to configure my mail server to accomplish that?

[hictio]

How many users are we talking about?
And how would they ask for a password renewal, thru a webfront or similar?

[psicloone]

I want to use script similar to this:

http://www.ibdhost.com/contact/

How many users are we talking about? I don`t know. The more users, the better...