Webmail is like hotmail. You run Qmail. You arrange a way for the mail to get out and back in to your box over your ISP's pipe. You provide a website. You provide a database. The database has helper scripts that take incoming mail from Qmail and stuff them into the RDBMS (or mail boxes and spools in the flat file system). Now you need a webserver too. The webserver has a web site.. with scripts calling into the RDBMS or mail spool.. it will fetch emails and allow web visitors to see their mail. Authentical (logins screen) will help the scripts figure out if visitors have the rights to see the email and which mail box to check in. It's that simple.
I talk too much.
If you are evil like me, and have occationally stray from the flock by wondering what it would be like to strip the RDBMS out of th equation--you could run IMP at www.horde.org/imp.. but the problem with that wonderful solutions is: 1) You don't get to use an RDBMS; 2) It's not even AOLserver!!??
