Does anyone know of any very simple, very low cost web based e-mail software that is extremely easy to use, run, and install on a Cobalt RaQ4i?

Go and check out www.hotscripts.com. There are numerous web based e-mail clients under perl and php.

I've installed phpop and it's good enough for personal use. Squirrel mail is pretty easy to install and it has a much better interface.

I'm 99% sure that RaQ's PHP has IMAP support compiled in, so there are a lot of packages (free) out there that work with IMAP.

Frank

Reccommend nwebmail if you are installing it just for one domain.
nwebmail is a cgi-bin app written in C. It is much (10X) faster than most PHP or Perl based programs.

http://nwebmail.sourceforge.net/