Mercurial > dovecot > original-hg > dovecot-1.2
annotate TODO @ 2820:f3e7ce34721f HEAD
config.rpath isn't supposed to be here..
| author | Timo Sirainen <tss@iki.fi> |
|---|---|
| date | Mon, 25 Oct 2004 21:50:04 +0300 |
| parents | 689e4235681f |
| children | 12fc3c22ffe8 |
| rev | line source |
|---|---|
| 2774 | 1 - lock_method=dotlock, mmap_disable=no crashes in cache locking |
| 2 - transaction log: when replacing log with a same sequence, we remove it from | |
| 3 log's file list, but we don't do anything to existing log views. this can | |
| 4 crash later in mail_transaction_log_view_set() because 'first' is from log | |
| 5 list, while we're comparing it into view->tail which it never is. also | |
| 6 overwriting it leaks memory.. | |
| 7 - mbox: when we're updating flags with lazy writing, we're still parsing the | |
| 8 mbox, just not writing to it! | |
| 9 - mbox: always add empty line. make the parser require it too? syncing should | |
| 10 make sure there always exists two LFs at end of file. raw-mbox-stream should | |
| 11 make sure the last message ends with LF even if it doesn't exist in the file | |
| 12 | |
| 13 if (sync_ctx.seen_first_mail && | |
| 14 sync_ctx.base_uid_last != sync_ctx.next_uid-1 && | |
| 15 ret == 0 && !sync_ctx.delay_writes) { | |
| 16 ^ doesn't work correctly with partial syncing? | |
| 17 - mail_index_lookup_ext() doesn't handle resizes between views. probably | |
| 18 needs size_t *size_r parameter added.. | |
| 19 - get_field() doesn't work if it's not already cached | |
| 20 - we probably shouldn't do duplicate detection/fixing?.. or at least stat() | |
| 21 the old file before trying, because we might have just previously seen the | |
| 22 old file and then new file and then we try to fix it.. | |
| 23 | |
| 24 - mbox: how well does dirty sync + status work? it reads the last mail every | |
| 25 time? not very good.. | |
| 26 - rawlog process gets stuck when imap dies: | |
| 27 send(1, 0xFFBFF4C8, 1024, 0) (sleeping...) | |
| 28 - subscribe: IMAP(anonymous): open(anonymous/mail/.temp...) failed: Permission denied | |
| 29 - we can mail_cache_add() same header multiple times.. | |
| 30 - configurable syslog prefix | |
| 31 - SIGHUP restarts auth processes .. but does it wait until they've finished | |
| 32 with all requests? | |
| 33 - SIGHUP rather shouldn't restart listening sockets if they didn't change.. | |
| 34 - dovecot-auth + ldap leaks? | |
| 35 - subscriptions file should contain namespace prefixes. at least optionally. | |
| 36 there's the subscriptions = yes setting now for namespaces.. do it so that | |
| 37 if prefix = "" has subscriptions, it contains prefixes. otherwise not. | |
| 38 - if auth process dies, login process should retry authentication if possible. | |
| 39 or if not, disconnect the client so it doesn't think the auth failed. | |
| 40 - mbox: syncing existing indexes takes 4x longer than creating new one, why? | |
| 41 | |
| 42 - caching | |
| 43 - force bits should be used only for nonregistered fields | |
| 44 - change envelope parsing not to use get_headers() so imap.envelope can | |
| 45 actually be cached without all the headers.. | |
| 46 - compression should drop fields with last_used < | |
| 47 (latest_mail_index_date - month) | |
| 48 - when parsing mbox or saving message, parse the mail through index-mail | |
| 49 so things gets saved into cache immediately | |
| 50 | |
| 51 - maildir: hardlink copying doesn't update indexes | |
| 52 | |
| 53 - dotlocking: stale_timeout should probably take into account how old the | |
| 54 file is.. so uses more time with more recent locks.. | |
| 55 | |
| 56 - COPY doesn't work to itself (lock assert crash) | |
| 57 - Create UW-IMAP like "DON'T DELETE THIS MESSAGE" message when mbox | |
| 58 gets empty | |
| 2143 | 59 - keep mbox lock for two extra seconds after sync |
| 60 - move /var/mail/user to ~/mbox if ~/mbox exists.. supposedly this | |
| 61 could be useful if /var/mail doesn't have quota, but ~/mail does. | |
| 62 now, what do we then do if we can move only some of the mails?.. | |
| 63 - if we can't create dotlock file for mbox, make sure it still can be | |
| 64 selected in read-only state | |
| 65 | |
| 66 - index | |
| 67 - optimize initial left_idx in mail_index_lookup_uid_range() | |
| 68 - when referencing log files, open them immediately? | |
| 69 - if log file is lost, generate it from old and new index | |
| 70 - make sure when changing flags multiple times in transaction it goes ok. | |
| 71 especially replace + dirty flag | |
| 72 | |
| 73 - post-login-sql-command | |
| 74 - add setting: ssl_options = bitmask. by default we enable all openssl | |
| 75 workarounds, this could be used to disable some of them | |
| 76 | |
| 77 - open("/var/run/dovecot//ssl-parameters.dat", O_RDONLY|O_LARGEFILE) =-1 ENOENT | |
| 78 ^ loops forever | |
| 79 | |
| 80 - don't return \* in PERMANENTFLAGS when we're full | |
| 81 | |
| 82 - support read-only logins. user could with alternative password get only | |
| 83 read-access to mails so mails could be read relatively safely with | |
| 84 untrusted computers. Maybe always send [ALERT] about the previous | |
| 85 read-only login time with IP? | |
| 86 - ~/.dovecotrc to override system wide settings. namespace settings should | |
| 87 override all the previous namespace settings instead of adding new. | |
| 88 | |
| 1553 | 89 - fix cygwin compile? _close and _read in *stream*.c fails. |
| 90 - handle out of quota conditions: | |
| 91 - if dovecot-uidlist can't be written, assume the new mails have UIDs | |
| 92 beginning from uidlist.next_uid. Whenever mails are expunged, overwrite | |
| 93 the next_uid field with the current highest next_uid. Whenever we have | |
| 94 assumed UIDs and uidlist gets updated, throw the client out with | |
| 95 "inconsist mailbox". | |
| 96 - make sure all syscalls check for ENOSPACE (and ENOACCESS while at it) | |
| 1410 | 97 - NFS safety: |
| 98 - .customflags: use rename(), but there's a problem when we have to remove | |
| 99 unused flags to make room for new ones. to fix that add new field in | |
| 100 the file, it would be set for flags which are currently unused. if that | |
| 101 field is set, .customflags must be locked before the flag is set to any | |
| 102 messages. but make sure there's no race conditions, we probably have to | |
| 103 wait a few seconds just to make sure no-one set a flag we want to remove | |
| 2143 | 104 - ESTALE |
| 1410 | 105 |
| 106 - send client IP immediately after accept() to master process. make sure | |
| 107 master shows the IP if login dies unexpectedly. master should probably also | |
| 108 kill the login process if it doesn't kill itself soon enough.. or maybe just | |
| 109 log the IP immediately. | |
| 110 | |
| 111 - ioloop-kqueue.c patch | |
| 112 - does dovecot-auth really break when it runs out of fds? | |
| 113 | |
| 114 - should we support some non-tokenizing way to parse mail addresses? .. | |
| 115 eg. "foo ? bar <x@y>" would now show up as "foo? bar <x@y>" | |
| 1178 | 116 |
| 2774 | 117 - when mailbox is deleted/renamed and someone else had it open, we get |
| 118 stat() error messages in log file. | |
| 1178 | 119 |
| 526 | 120 - bugs |
| 1178 | 121 - CREATE a, CREATE b, save mails into them, DELETE a, RENAME b a. |
| 122 -> breaks if a+b have same UIDVALIDITY. We could update the | |
| 123 UIDVALIDITY for the renamed mailbox and all mailboxes under it. | |
| 124 Then return with tagged "OK [NEW-UIDVALIDITY 1234] Renamed". Assuming | |
| 125 other IMAP people agree to that. | |
| 526 | 126 |
| 127 - reliability fixes: | |
| 860 | 128 - limit folder hierarchy levels? user can now create eg. a/a/a/a/... |
| 129 and then start renaming them from end to beginning, which probably will | |
| 130 at some point start causing syscall failures which will fill up logs. | |
| 1410 | 131 - dotlock overriding is racy, but it's pretty difficult to fix it. Also |
| 132 overriding someone else's dotlock in shared folder isn't possible. These | |
| 133 could be fixed by having separate lock process running as root, which | |
| 134 would chown() the file for another uid and then unlink() it as that user. | |
| 135 One problem with that is that if malicious user sets setuid+execute bits | |
| 136 on for the file, he could run the file and get changed to the new uid. | |
| 137 That hopefully shouldn't matter much since the new uid should be user | |
| 138 with minimum possible privileges. Anyway, optional.. | |
| 474 | 139 |
| 526 | 140 - checks: |
| 141 - make sure SELECT rebuilds index properly when next_uid is near 32bit value | |
| 142 - make sure connection limits work | |
| 1211 | 143 - check if some asserts should be changed into if/i_panic code, so that |
| 144 disabling asserts would be possible | |
| 526 | 145 |
| 146 - enhancements: | |
| 852 | 147 - option to disable SORT, SEARCH and other memory/cpu-intensive features. |
| 1211 | 148 defaults and per-user by dovecot-auth. |
| 526 | 149 - maildir could support also the dirty-flag in messages. files would be |
| 150 renamed "whenever there's time" (that'd require the indexer program, or | |
| 151 forking and doing it in background) | |
| 634 | 152 - OpenSSL: support generated DH parameters |
| 1250 | 153 - SSL: Support password protected key files. Support reading the password |
| 2143 | 154 from user at runtime (dovecot startssl or something). currently it just |
| 155 hangs. | |
| 725 | 156 - check with strace what dovecot does when evolution checks new mail, |
| 157 it's quite a lot. some things probably wouldn't need to be done | |
| 2143 | 158 (mkdirs inbox) and other things could be cached in memory. |
| 159 - sort: we could create alternative indexes for different sort conditions. | |
| 160 sort code itself already supports this optimization. | |
| 965 | 161 - support zlib compressed mbox/maildir? mbox maybe just read-only. |
| 1410 | 162 do it through istream-zlib wrapper |
| 965 | 163 - THREAD=ORDEREDSUBJECT - although pretty useless I'd think. |
| 164 | |
| 165 - logging | |
| 1250 | 166 - Login: username 1.2.3.4:1025 5.6.7.8:993 imaps,compressed |
| 167 - Logout: username 1.2.3.4:1025 5.6.7.8:993 imaps,compressed in:1000 out:1000000 | |
| 168 - n failed login attepts (before failure or success, once in n seconds) | |
| 605 | 169 |
| 170 - lib-charset: | |
| 634 | 171 - utf8_toupper() is a must. and a bit difficult if we want to do it right. |
| 605 | 172 - add support for other things than iconv() as well? we could reuse |
| 173 the code from cyrus or courier | |
| 795 | 174 - cache iconvs? they'd probably be faster if we just reset the |
| 175 conversion instead of opening new one every time. and there will likely | |
| 176 be only one or two charsets which are used for nearly all conversions. | |
| 526 | 177 |
| 852 | 178 - should we allow following symlinks in mbox/maildirs? they are now. |
| 1250 | 179 - if we implement shared mailboxes with shared indexes, never do that or |
| 180 others could symlink your personal mailboxes and see the indexes | |
| 181 created for it which may contain envelope etc. data | |
| 182 - this allows circular mailbox hierarchies which should be prevented by | |
| 183 eg. allowing max. 20 hierarchies. | |
| 852 | 184 |
| 1250 | 185 - index: |
| 186 - we could try compressing same from/to/subject fields into a single | |
| 187 location in data file. requires larger changes.. | |
| 1410 | 188 - Most messages are text/plain/7bit/us-ascii/no-other-content-type-params. |
| 189 Instead of saving tons of nearly identical BODY/BODYSTRUCTURE fields | |
| 190 into cache, we could just set INDEX_MAIL_FLAG_TEXT_PLAIN_7BIT_ASCII bit | |
| 191 on and generate the bodystructure for such messages on the fly. | |
| 1250 | 192 - read-only support for mailboxes where we don't have write-access |
| 193 - if .customflags is removed and Maildir files have custom flags, add | |
| 194 "unknown1" "unknown2" etc. flags to .customflags file for each found flag | |
| 195 - support storing message headers into indexes. this could be useful when | |
| 1410 | 196 indexes are in local disk but actual mails are accessed through NFS. |
| 1250 | 197 - if we wanted to support huge mailboxes with small memory usage, it'd now |
| 198 be possible if we just instead of mmap()ing the whole index files would | |
| 199 have maybe 3-4 256k mmap()ed areas which we move based on the need. | |
| 2143 | 200 - should work fine with imap.index and imap.index.cache |
| 1250 | 201 - log files aren't affected by mailbox size |
| 202 - but, is it worth the trouble really? the OS can do all this itself, | |
| 203 only thing we're doing is keeping the processes virtual memory usage | |
| 204 small. | |
| 0 | 205 |
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206 - SEARCH: |
| 1250 | 207 - message_body_search() could accept multiple search keywords so we |
| 208 wouldn't need to call it separately for each one (so we wouldn't need | |
| 209 to parse the message multiple times). | |
| 210 - message_body_search() could support NULL MessagePart and the searching | |
| 211 could be done while parsing the message. this would need changes to | |
| 212 message_parse() as well. | |
| 213 - could optionally support scanning inside file attachments and use | |
| 214 plugins to extract text out of them (word, excel, pdf, etc. etc.) | |
| 215 - use a trie index for fast text searching, like cyrus squat? | |
| 216 - Create our own extension: When searching with TEXT/BODY, return | |
| 217 the message text surrounding the keywords just like web search engines | |
| 218 do. like: SEARCH X-PRINT-MATCHES TEXT "hello" -> * SEARCH 1 "He said: | |
| 219 Hello world!" 2 "Hello, I'm ...". This would be especially useful with | |
| 220 the above attachment scanning. | |
| 0 | 221 |
| 1250 | 222 - general: |
| 223 - sieve (rfc3028), we can use Cyrus Sieve | |
| 224 - rfc2231 continuation support | |
| 1553 | 225 - rfc2557 support for BODYSTRUCTURE, as specified by RFC3501 |
| 226 - lmtp server - is it needed? dovecot-deliver binary at least would be | |
| 227 useful | |
| 1250 | 228 - create indexer binary |
| 229 - support Maildir++ quota | |
| 18 | 230 |
| 1250 | 231 - cleanups: |
| 232 - check if t_push()/t_pop() should be added somewhere | |
| 233 - try to fix @UNSAFE code to use buffer API instead | |
| 1553 | 234 - subscription-file.c, custom_flags |
| 1250 | 235 - [io]stream-file.c? |
| 236 - grep for FIXME | |
| 0 | 237 |
| 1250 | 238 - auth / login: |
| 2143 | 239 - kchuid, SRP |
| 1250 | 240 - Digest-MD5: support integrity protection, and maybe crypting. Do it |
| 241 through login process like SSL is done? | |
| 242 - dovecot-auth should limit how fast authentication requests are allowed from | |
| 243 login processes. especially if there's one login/connection the speed | |
| 244 should be something like once/sec. also limit how fast to accept new | |
| 245 connections. | |
| 2774 | 246 - if passdb = userdb, ask them both in one query and cache it. implement |
| 247 passwordcheck userdb using the caching. | |
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248 |
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249 capabilities: |
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250 - preferrably all should be possible to #ifdef away by a configure |
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251 option (--without-capabilities=acl,namespace,...) |
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252 - possibility to disable them from config file |
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253 - acl (rfc2086, draft-ietf-imapext-acl), namespace (rfc2342) |
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254 - probably do it like cyrus. "user.<username>" to access other |
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255 users, with "" defaulting to "user.<myself>". these should be |
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256 configurable however. |
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257 - shared namespaces? maybe configurable in config file |
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258 - easiest way to do ACL would be to use unix modes, but is that |
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259 useful at all? Well, ACL2 has a bit better support for that, so |
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260 maybe we could support it. |
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261 - otherwise gets a bit trickly, we could keep all mail in "imapmail" |
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262 group and 0600/0700 mode by default, but when mail is shared to others, |
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263 the group read/write access bits would be set. or alternatively we |
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264 could launch another imap process to handle it, which we should support |
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265 anyway. ACLs could be stored into ".acl" ascii file in each folder. |
| 480 | 266 - support for private and shared flags, configurable by mailbox admin. |
| 267 this isn't in any draft yet, but ACL2 author was going to create one. | |
| 268 [SHAREDFLAGS (...)] would specify which ones are shared, don't know yet | |
| 269 how they would be configured. | |
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270 - quota (rfc2087, draft-cridland-imap-quota) |
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271 - give filesystem values only to admins |
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272 - support for Maildir++, probably no need to support more. |
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273 quota capability supports complex quota configuration, but if |
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274 no mailer supports them we probably shouldn't bother either |
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275 - id (rfc2971) |
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276 - must be configurable what gets sent, default to only name=Dovecot |
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277 - separate pre/post-login settings |
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278 - optionally log configured parts of the client information, but only |
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279 once, probably at the same time as logging "Logged in", |
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280 "Disconnected", etc. |
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281 - remember to force truncating values longer than 30 chars, |
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282 especially before logging |
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283 - mailbox-referrals (rfc2193) |
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284 - this is useful whenever we would otherwise need to make the |
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285 connection ourself. for example load balancing and shared mailboxes |
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286 requiring another UID to run. |
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287 - this rfc defines no exact way for server to detect if client |
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288 supports referrals or not. I don't think there's much point in |
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289 supporting only referrals, as most clients don't support them. |
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290 Instead we should return referrals when we know that client |
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291 supports them, otherwise do the connecting ourself. If client |
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292 issues RLIST or RLSUB command, it's safe to assume it supports |
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293 referrals. |
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294 - for load balancing this works just fine, but what about shared |
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295 mailboxes which require different UID? If we login with our own |
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296 username, we end up with our own UID instead of what we wanted. |
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297 IMAP URLs don't support separated authorization id which would |
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298 have made this very easy.. We could give the "userid@group" as |
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299 userid, but clients probably treat it as different userid and |
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300 ask the password again. |
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301 - problems, problems, .. maybe not worth the trouble. |
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302 - drafts: |
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303 - http://www.imc.org/ids.html |
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304 - annotate (draft-ietf-imapext-annotate) |
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305 - per-message annotations. this will be major change. especially |
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306 because currently there's no suitable storage for them, and |
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307 they'll probably change all the time.. maybe if we moved into |
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308 berkeley db to store the .data file and these annotations. |
| 1178 | 309 - this is separate problem from index files. indexes are treated as |
| 310 temporary files, annotations are permanent data. we'd have to | |
| 311 support non-db way to do this too, which would probably be just a | |
| 312 simple (slow) text file. | |
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313 - annotatemore (draft-daboo-imap-annotatemore) |
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314 - server and per-mailbox annotations. much easier than |
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315 per-message annotations, but they'd be easier to place into |
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316 db as well. |
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317 - binary (draft-nerenberg-imap-binary) |
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318 - perhaps not too useful. I'd like to make Dovecot fully |
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319 binary-safe though. |
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320 - view (draft-ietf-imapext-view) |
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321 - slow, complex, luckily draft expired almost two years ago. |
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322 i hope i don't have to implement this :) |
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323 - can be done client-side just fine (evolution's virtual folders) |