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