4 (The upper item has the greater priority or feasibility... maybe :-)
7 o full-text search of messages (plain, or hooking up with Namazu)
8 o original icons and logos
11 o speed-up of filtering
12 o regular expression support at filtering
14 o parallel processing between sending-receiving and others
15 o support for some formats other than MH and mbox (ex. Maildir)
16 o priority (Priority:, X-Priority:, X-MSMail-Priority:)
17 o notification of reception (Disposition-Notification-To:)
18 o customization of key bindings
19 o customization of toolbar
20 o configuration for each folders
21 o RFC 2231 (MIME filename encoding) compliant
25 o console mode interface
27 o mailing list manager
28 o inline image display on multipart MIME
30 o make the code cleaner
31 o make the process faster
32 o make the dubious English much decent :)
34 Partially implemented features
35 ==============================
36 . make the network related code much decent
37 (processing of time out, multi-threading etc.)
39 . full internationalization
43 . display of HTML messages (composition of HTML message is not scheduled :-P)
44 . progress display of time-consuming processes
45 . modification of display color
49 * multipart MIME (attachments of files)
52 * management of read message on POP server by UIDL
55 * reconnection when connection to news server is broken
57 * preservation of position or size of window
58 * external editor support
60 * extension of quotation format
61 * assignation of location of mail folder
62 * account selection on composition window
63 * posting to newsgroups
64 * completion of mail address
65 * prohibition of multiple execution (with Unix domain socket)
66 * periodical check of newly arrived mails
67 * designate the displayed headers
68 * user-defined headers
69 * list view of newsgroups and subscription of groups from there