[techtalk] Web-based e-mail for Linux?

[jennyw]

I'm finally going to put together a mail server.  I'm used to using
IMAP4/POP3 and Web-based e-mail from my current provider, so I would like to
build a mail server that has the same functionality. Does anyone have
suggestions on what software packages I could use to accomplish this, and
links to where I can read more about them?  Mostly I just want to know what
software is available for these purposes -- I don't need a how-to just yet.

Thanks!

Jen