TODO:

* doubleclick in message list brings up another window
* PGP support
* how to keep filters from being run more than once??
* added preference panel support to plugins
* spelling
* implement empty trash on exit
* allow different sender addresses
* cleanup message cache when a source is deleted
* sig files
* multi threading
* allow changing of displayed headers in message list
* prettier mail headers in plain text message window
* LDAP/GnomeAddress book support
* find a decent html widget
* parse urls in mail text
* support /var/spool/mail files
* make imap message cache writing faster
* should be able to startup without hitting the network at all:
   need to cache imap folders
* other types of mail folders? (maildir, etc)
* speed up IMAP mail checks
* add option to delete pop mail from server after some amount of time
* get working under Winbloz
* find hooks into Mozilla for clicks, etc.
* do news reading??