(The upper item has the greater priority or feasibility... maybe :-)
+o enhancement of filtering
+o improvements of addressbook
o POP before SMTP
o original icons and logos
-o improvements of addressbook
-o folder management enhancements
+o more efficient SMTP handling for multiple messages
o more robust IMAP4 response parser
-o enhancement of filtering
o support for some formats other than MH and mbox (ex. Maildir)
o priority (Priority:, X-Priority:, X-MSMail-Priority:)
o notification of reception (Disposition-Notification-To:)
o autosave
o customization of toolbar
-o configuration for each folders
o RFC 2231 (MIME filename encoding) compliant
o full-text search using Namazu
o virtual folder
. make the network related code much decent
(processing of time out, multi-threading etc.)
. drag and drop
-. full internationalization
+. internationalization / multilingualization
. PGP/GPG support
-. display of HTML messages (composition of HTML message is not scheduled :-P)
+. display of HTML messages (composition of HTML message is not planned :-P)
. progress display of time-consuming processes
. parallel processing between sending-receiving and others
. customization of key bindings
* template function
* regular expression support at filtering
* autowrap / wordwrap
+* configuration for each folders