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