Looking for a cgi for web-based mail

[gerry]

I'm starting a search for a tool that will let me allow users who aren't
local to use a web browser, log in and check e-mail on the linux box back
here at the University.  Something similar to a HotMail-type interface.

Anyone know of something like this that's freely available?

Thanks in advance,
Gerry Creager
Mapping Sciences Lab
Texas A&M University