I just made a new email address just to collect emails from the main one (which has 7000+ emails and a java webmail) via POP3/IMAP (it has a "mail collector" functionality)... I'll be using it as a read-and-reply/delete box, keeping only the important emails... ^^
at home I'll be using my normal address instead.

quite proud of the solution I thought of to keep the mail client on the N900 reactive and still use the default approach (Modest) via IMAP.

(sorry for slipping offtopic, but may be useful for somebody here)