- dovecot - dovecot.org

Re: [Dovecot] Blocked
by Joseph Tam 09 Dec '06

09 Dec '06

On Fri, 8 Dec 2006, dovecot-request(a)dovecot.org wrote: > Date: Fri, 08 Dec 2006 12:33:04 +0100 > From: Jos Chrispijn <jos(a)webrz.net> > Subject: Re: [Dovecot] Blocked > > ... > I block pop3 to force my users to use webmail (that is in fact using IMAP). > What mechanism should trigger sending a message that pop3 is blocked? > Once this message is send, it is either send by postfix to alternative > email account (Postfix forward) or just read once thru Webmail. In the > mean time this user is trying to establish pop3 on a 24/7 basis $-) If you are not selective on which users get the message (i.e. you want this notice to go out to all POP users), then you can do what the previous poster said and make a read-only mailbox and redirect the user's INBOX to this file (via symlinks, or dovecot.conf or what-have-you). This is probably the easier route. Another easy solution might to use tcp-wrappers and reply to all connections to port 110 with -ERR Please contact ... Some (most?) mail readers will pop this message to the user. Another solution which I employed (for another reason) is to make your own mini-dameon which enters into a fake POP session. Just allow any authentication information and server up your fake notice. The POP3 protocol is fairly simple and you only have to implement a small subset of commands: user(noop), pass(noop), list, stat, retr, top, rset(noop), noop(noop), dele(noop), quit. I return a "OK" for most of these commands and most of them are noops. I wrote a patch for qpopper to do this but you could probably modify the source to make it a stand-alone server: http://www.math.ubc.ca/~tam/Software/Qpopper.M2W/m2w.patch For the curious, the reason why I had to make this bizarre patch: http://www.math.ubc.ca/~tam/Software/Qpopper.M2W/ Joseph Tam <tam(a)math.ubc.ca>

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[Dovecot] Dovecot+outlook express timeout error
by Artur Słowik 09 Dec '06

09 Dec '06

Hi When my outlook express client first time connect to Dovecot pop3 server, I receive error timeout 60s. When I close client and run client again then client receive mail correctly. I have in config file: //pop3_client_workarounds = outlook-no-nuls, oe-ns-eoh// best regards Arti

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Re: [Dovecot] Blocked
by Kenny Dail 08 Dec '06

08 Dec '06

> I block pop3 to force my users to use webmail (that is in fact using IMAP). > What mechanism should trigger sending a message that pop3 is blocked? > Once this message is send, it is either send by postfix to alternative > email account (Postfix forward) or just read once thru Webmail. In the > mean time this user is trying to establish pop3 on a 24/7 basis $-) What's wrong with just ignoring the login attempts? Why not stop listening for POP3 altogether? Or, you can block the particular user at the firewall. Or if you have a special someone who is allowed POP3 you can give them an alternate port to login with, and not listen at all on port 110 if it really bothers you. -- Kenny Dail <kend(a)amigo.net>

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Re: [Dovecot] Blocked
by Jos Chrispijn 08 Dec '06

08 Dec '06

Dominic Marks: > An alternative which does this is to replace their mailbox with > a read-only mbox or maildir containing a single mail with the > 'you have been blocked' message you want. Obviously you would > need to allow them to log in again, but they would only receive > the message you choose. I block pop3 to force my users to use webmail (that is in fact using IMAP). What mechanism should trigger sending a message that pop3 is blocked? Once this message is send, it is either send by postfix to alternative email account (Postfix forward) or just read once thru Webmail. In the mean time this user is trying to establish pop3 on a 24/7 basis $-) Jos

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[Dovecot] Blocked
by Jos Chrispijn 08 Dec '06

08 Dec '06

I have blocked some pop3 user sessions: Dec 8 00:03:38 xxxxxx pop3-login: Disconnected: user=<johndoe> Is there a way of sending a message to a user that constantly tries to establish a block pop3 session? Example: From: noreply(a)mysite.com Subject: Your POP3 session Message: Hello, Your POP3 session is blocked; please contact systemmanagement --

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Re: [Dovecot] Blocked
by Jos Chrispijn 08 Dec '06

08 Dec '06

Alan Premselaar schreef (08-12-06 3:06): > if you're blocking their POP3 access, how are those users ever supposed > to receive that mail notification? > That's simple: i am blocking them on username. Example: I am blocking johndoe's pop3 session. In Postfix I forward all mail for johndoe to johndoe(a)another.email.adress.com So johndoe can still receive mail. > Also, what if it's a brute force bot or something trying to access a > random blocked account via POP3? (alright, not as likely, but still > possible) > There you've got a point... > a more suitable solution would be if there was a way to return an error > during the authentication process that was returned as a result of > trying to authenticate to a blocked user. > The text I am sending could be any text, from 'your pop3 box = blocked' to '<any errornumber> on your POP3 box' Jos

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[Dovecot] specifying INBOX with maildir for mail_location
by Post Master 08 Dec '06

08 Dec '06

I'd like to store all of my mail in maildir, but I want to store the inbox and indices on fast storage and everything else on deep storage. Does the following configuration value for mail_location accomplish this? mail_location = maildir:/data/deep/%Ld/mail/%Ln:INBOX=/data/fast/%Ld/mail/%Ln:INDEX=/data/fast/%Ld/indices/%Ln ------------------------------------------------------------------------ If not, does the following configuration accomplish this with namespaces? mail_location = maildir:/data/fast/%Ld/mail/%Ln:INDEX=/data/fast/%Ld/indices/%Ln namespace private { separator = / inbox = yes hidden = yes prefix = location = } namespace private { separator = / hidden = yes prefix = ??? location = maildir:/data/deep/%Ld/mail/%Ln/??? } ------------------------------------------------------------------------ Actually, I can't quite finish the namespace configuration. I'd like to set something like: prefix = * location = maildir:/data/deep/%Ld/mail/%Ln But I suspect the '*' won't actually match everything, and even if it did, I suppose it would also match the inbox. I began with listing any and every typical folder in its own namespace like: namespace private { separator = / hidden = yes prefix = drafts location = maildir:/data/deep/%Ld/mail/%Ln/drafts } namespace private { separator = / hidden = yes prefix = templates location = maildir:/data/deep/%Ld/mail/%Ln/templates } namespace private { separator = / hidden = yes prefix = sent location = maildir:/data/deep/%Ld/mail/%Ln/sent } and so on, but that doesn't seem very elegant. Also, namespaces scare me for client compatibility. Am I missing something obvious?

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[Dovecot] Extra inbox problem
by Stephen Allen 07 Dec '06

07 Dec '06

One of my users (who uses Outlook) has lost all her folders that were inside her INBOX. She collects her mail by IMAP. I have confirmed that she has no folders in her INBOX. However, if I use Pine, I can see a couple of extra folders, "INBOX." and "Junk Email." that I don't think should be there. There already folders by that name but without the dot on the end. If I look in "INBOX." I can see the folders she's missing and the folder that they contain etc. I backed up and moved the files listed under .maildir, and Dovecot recreated them, but it made no difference to the problem. I don't understand why those extra folders appear in Pine, but not Outlook. Kind regards, Steve

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[Dovecot] rc15 dumped core
by Hans Morten Kind 07 Dec '06

07 Dec '06

We have been running rc15 since Sunday experiencing no trouble, but today one user crashed. rc15 on Solaris-5.9, the server had app 6GB free memory at the time of the crash, app 70% idle running with an avg.load at 4 of 8 processors available. The USER's INBOX was quite smooth, app 13MB containing 320 messages. The core dump was accompanied with these log-entries: Nov 23 2006 12:27:00 [local3.error] IMAP(USER): Corrupted index cache file imapindex/USER/.imap/INBOX/dovecot.index.cache: invalid field header size 12:28:23 [local3.error] IMAP(USER): mremap_anon(1164206080) failed: Not enough space 12:28:23 [local3.error] IMAP(USER): mremap_anon(8192) failed: Invalid argument 12:28:24 [local3.error] child 17510 (imap) killed with signal 10 12:28:25 [local3.info] imap-login: Login: user=<USER>, method=PLAIN, rip=000.177.00.21, pid=19178 We have been observing a few of the 'invalid field header size' messages while running rc15. But as this USER, others seem to recover after the message has been logged. The messages from 'mremap_anon' have never been seen before. Actually '1164206080' looks very much like a timestamp, differing 75223 seconds from the time of the crash ... spooky I will start running the supplied code for memory debugging on this user and I enclose a back trace from the crash. The interessting stuff from the back trace is probably that hdr (and so cache->hdr) is 0xffffffff so that hdr->continued_record_count gives no sense (Cannot access memory at address 0xb) but cache->index->map->records_count is 320 Still on this and another server running rc15 (Sol5.8), we have thousands of happy users beeing served very fast by Dovecot. hmk

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[Dovecot] rc15 sort bug
by Cor Bosman 07 Dec '06

07 Dec '06

Hi, ive come across what looks like a bug in how dovecot sorts the mail when sorting on subject. We noticed this on our current beta8 version, and I can also reproduce it in rc15. One of our customers has hundreds of emails with subjects like this: Subject: 20060823 Kanglaonline-NSCN(IM) cadres violating Tml truce: NSCN(K) Subject: 20060824 LSE - Shell jv denies 3.2 bln usd fraud claims by Nigerian parliament Subject: =?iso-8859-1?Q?20060824_Ibinda_-_Onze_militares_angolanos_mortos_em_comba?= Subject: =?iso-8859-1?Q?20060824_Gingaocultural=2C_VoA_-_Deputados_constatam_clima?= Some of the Subject lines are encoded, some arent. All the encoded Subject lines end up being sorted wrong. Here is a UID SORT output: * SORT 3 4 5 10 20 26 27 28 29 30 33 35 36 37 39 43 44 46 47 58 59 60 83 85 87 8 8 89 90 93 112 113 115 116 118 124 126 127 130 131 132 134 135 137 139 140 141 1 79 205 206 208 209 210 211 212 215 217 226 237 238 240 241 250 282 283 285 291 2 92 293 314 315 316 317 318 319 320 321 328 329 330 337 355 377 378 379 380 381 3 82 383 384 385 407 411 413 423 427 398 409 367 374 376 371 348 372 353 369 400 3 66 352 396 50 370 354 402 347 404 412 415 356 419 408 414 420 388 243 251 21 386 31 1 2 7 6 9 8 349 13 11 12 32 15 34 14 16 22 23 18 17 25 24 19 45 38 48 397 40 3 49 41 40 42 421 56 82 54 53 51 55 52 57 86 63 64 61 62 65 67 71 66 77 76 72 74 75 68 70 84 69 73 80 81 78 79 91 92 128 133 94 97 98 95 96 242 100 102 99 101 1 03 249 114 105 104 247 108 106 107 109 111 375 110 117 387 322 129 125 136 122 1 21 123 144 143 120 233 119 138 142 166 214 149 156 153 155 152 158 159 165 162 1 51 157 154 148 150 160 145 146 147 161 410 418 417 163 164 172 168 173 171 170 1 69 167 178 174 175 176 177 180 184 181 182 186 183 185 213 389 230 232 207 231 2 29 246 216 234 248 225 390 189 275 277 187 340 204 200 197 195 194 192 193 191 1 99 198 196 416 188 190 391 350 201 218 202 245 203 361 228 279 239 220 224 221 2 23 222 235 244 219 280 236 281 278 252 254 304 351 256 257 253 255 274 276 273 2 64 265 263 261 262 258 272 260 259 294 357 227 290 269 286 358 266 270 271 268 2 87 267 288 284 289 359 310 309 307 303 305 306 373 295 300 297 298 296 299 311 3 12 302 308 301 313 332 325 326 324 323 333 346 327 331 362 334 339 335 336 360 3 41 344 338 345 342 343 401 365 392 363 368 399 394 405 395 406 422 424 425 426 4 29 428 393 For instance, UID 112 is an encoded subject and should appear after UID 111 later on in the output. Bug or feature? Regards, Cor Bosman XS4ALL

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