in my case i have a pop3 account where all messages with no specified mailbox goes to. if knew from a few (german) webhosters that they also do so. i don't know if any webhoster support imap. would be easier to handle but i don't think that many poeple have a chance to use such an account, so i think it would be the best way to implement pop3-support first. if we don't delete the messages from the server it would increase the trafic, so i don't think that makes sence. there could be an option to forward every unknown messages to another mailadresse. Should not ne so hard to do.
What about addressbooks? I think we should first make the plain webmailer with just getting and sending messages.
What i do not know is how to handle inkomming html-mail. we could make a list of allowed html-tags. i think this is the easiest way. for sending just making the bb-code to html and evtl. attaching pic's (like this 8) ).
Do you want pop3 acces for useres? i can't see any possibillities to get that work with this method. But i think nobody has acces to sendmail-config files and than that's a good way.
What do you think?
Come to where the woods are...