4
Also sqmail or TropicalMail (both in repository). TropicalMail installed quite neatly, but I don't know about the signing up feature you'd also been asking about.
I have to say, though, I ended up not liking the integration into XOOPS. Gets tight on the screen, with the menues and other items you may have configured to show on all user pages. So, I ended up firing up an independent installation of
squirrelmail in a fresh window which, I think, is also better supported than the ports and what know I you may have as XOOPS modules. May be an issue, particularly when it comes to email. Sorry all hardcore XOOPSers.
