September 2010 - dovecot

[Dovecot] (Single instance) attachment storage with single-dbox
by Timo Sirainen 19 Oct '10

19 Oct '10

Just a note to myself and whoever else cares, should be added to wiki once it has its own page about this: With single-dbox messages can be copied with hard linking. This means that there can be multiple files that point to the same attachment file. The attachment is now deleted only once the mail file's link count drops to zero, so this works fine.. ..until someone goes and starts manually copying files or maybe restoring from backups or whatever, causing the hard links to be replaced with separate files having link count=1, even when there are other files pointing to the same attachment file. Now deleting this one mail will delete the attachment too early. I can't think of any other reasonable way to handle this though, so unless someon has some great ideas, I think the solution is to simply add enough warnings that message store shouldn't be accessed directly. Maybe add some import/export commands to doveadm which can be used to add a bunch of mails to storage without doing it directly on filesystem.

4 7

[Dovecot] kmail-error: can't upload folder (imap-account on dovecot-server)
by cool.chris65＠web.de 17 Oct '10

17 Oct '10

Hello, I've some trouble with my kmail (Version 1.13.5 / KDE 4.5.1, Kubuntu 10.04 and a dovecot-imap-server on debian etch (dovecot 1.0.rc15-2etch5). Everytime I try to create a folder under my imap-inbox, I get an error like "can't upload folder...", but after this message I can see a new folder under my inbox-folder, but I can't use it ... With a thundermail-client I can create a subfolder without any erro and I can use it r (but only first level). My conf: # /etc/dovecot/dovecot.conf log_path: /var/log/dovecot/dovecot.log info_log_path: /var/log/dovecot/dovecot.log disable_plaintext_auth: no login_dir: /var/run/dovecot/login login_executable: /usr/lib/dovecot/imap-login login_greeting: Herzlich Willkommen, %u. mail_location: mbox:~/mail imap_client_workarounds: outlook-idle tb-extra-mailbox-sep auth default: passdb: driver: passwd-file args: /etc/passwd.dovecot userdb: driver: passwd The reason for using debian etch and dovecot 1.0 is the hardware: it's running on a Fritzbox-Router, and there is actual a littlebit trouble with lenny (often crashing, reboots of the whole box etc.) I hope, someone can help me ... Thanx and greetz, Christoph -- GPG-Fingerprint: 171A 6F66 52E5 A6CE D664 2427 832F E711 7442 8261

5 4

[Dovecot] Panic: Leaked t_pop() call
by Len7hir 14 Oct '10

14 Oct '10

I have version 2.0.0 and upgraded to 2.0.2 and after - this is happend: Raw backtrace: /opt/dovecot2/lib/dovecot/libdovecot.so.0 [0xb7e3425e] -> /opt/dovecot2/lib/dovecot/libdovecot.so.0 [0xb7e342b5] -> /opt/dovecot2/lib/dovecot/libdovecot.so.0 [0xb7e338d6] -> /opt/dovecot2/lib/dovecot/libdovecot.so.0 [0xb7e31cb1] -> dovecot/pop3(client_handle_input+0x8e) [0x804be7e] -> /opt/dovecot2/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x120) [0xb7e40d30] -> /opt/dovecot2/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) [0xb7e3f6b8] -> /opt/dovecot2/lib/dovecot/libdovecot.so.0(master_service_run+0x2a) [0xb7e2cf5a] -> dovecot/pop3(main+0x226) [0x804af66] -> /lib/tls/libc.so.6(__libc_start_main+0xc8) [0xb7cd0ea8] -> dovecot/pop3 [0x804ab51] Sep 10 13:11:32 pp6 dovecot: master: Error: service(pop3): child 14507 killed with signal 6 (core dumped) This is core dump: #0 0xb7d01947 in raise () from /lib/tls/libc.so.6 #1 0xb7d030c9 in abort () from /lib/tls/libc.so.6 #2 0xb7e5126d in default_fatal_finish (type=<value optimized out>, status=0) at failures.c:164 #3 0xb7e512b5 in i_internal_fatal_handler (type=LOG_TYPE_PANIC, status=0, fmt=0xb7e76391 "Leaked t_pop() call", args=0xbf82ac94 "\n") at failures.c:600 #4 0xb7e508d6 in i_panic (format=0xb7e76391 "Leaked t_pop() call") at failures.c:230 #5 0xb7e4ecb1 in t_pop_check (id=0xbf82acc8) at data-stack.c:267 #6 0x0804be7e in client_handle_input (client=0x8080f38) at pop3-client.c:621 #7 0xb7e5dd30 in io_loop_handler_run (ioloop=0x8058370) at ioloop-epoll.c:212 #8 0xb7e5c6b8 in io_loop_run (ioloop=0x8058370) at ioloop.c:350 #9 0xb7e49f5a in master_service_run (service=0x80582c0, callback=0x804b090 <client_connected>) at master-service.c:496 #10 0x0804af66 in main (argc=0, argv=0x0) at main.c:250 If You want core file I can send, but maybe this is unnecessary. -- Len7hir

2 2

[Dovecot] Error on mailbox file
by augustocasagrande＠gmail.com 14 Oct '10

14 Oct '10

Hi! I'm running Postfix 2.2.9 as MTA. I have several mail clients , such as Outlook 2000/xp/2007. The clients comunicate to the MTA using pop3/smtp protocols. I have also installed Webmail Squirrel for the internet users. Squirrel needs an Imap server, so i have utilized Dovecot 1.2.6. To authenticate users , i use pam_winbbind to validate users to my NT domain. Here is my problem : Today i checked my /var/log/mail log and this took my attention : Sep 29 08:25:07 host1 dovecot: imap-login: Login: user=<USER>, method=PLAIN, rip=172.20.22.12, lip=172.20.22.14 Sep 29 08:25:07 host1 dovecot: IMAP(user): mail_location: mbox: mkdir(/home/NT-DOMAIN/user/mail) failed: Permission denied (euid=10188(user) egid=10001(domain users) missing +w perm: /home) Sep 29 08:25:07 host1 dovecot: IMAP(user): Fatal: Namespace initialization failed Here , i assume the user put his user name in CAPS (USER), and that i generating an error. Then Dovecot tries to create the directory /home/NT-DOMAIN/user/mail. In my dovecot.conf file , i have : mail_location = mbox:~/mail:INBOX=/var/mail/%u Now , the log continues : Sep 29 08:25:18 host1 dovecot: imap-login: Login: user=<user>, method=PLAIN, rip=172.20.22.12, lip=172.20.22.14 Sep 29 08:25:18 host1 dovecot: IMAP(user): mail_location: mbox: mkdir(/home/NT-DOMAIN/user/mail) failed: Permission denied (euid=10188(user) egid=10001(domain users) missing +w perm: /home) Sep 29 08:25:18 host1 dovecot: IMAP(user): Fatal: Namespace initialization failed Here the user re-enters the user, now correctly, but the problem persists . Finally , a could see this new log entry : Sep 29 10:50:43 host1 postfix/local[19663]: 50B98441E0: to=<user(a)domain.com>, orig_to=<user(a)domain.com>, relay=local, delay=0, status=bounced (cannot access mailbox /var/mail/user for user user. cannot open file: Permission denied) Here some user tries to send an email to this user , and a permission denied error occurs. Watching the permissions on the file : -rw------- 1 user users 1499655 2010-09-29 02:18 /var/mail/user Maybe some Dovecot process is blocking the file access ? List of Dovecot process: ps ax | grep dovecot 25997 ? Ss 0:07 /usr/sbin/dovecot 15399 ? S 0:02 dovecot-auth 20614 ? S 0:00 dovecot-auth -w How can i fix this issue? Thank you very much ! Augusto

2 7

[Dovecot] LMTP proxy too many DATA output timeout (perhaps)
by Luca Palazzo 05 Oct '10

05 Oct '10

Hi All, we are getting a lot of this message from dovecot director. They seem to be too many. Backend servers do not log anything and postfix logs a lot of these errors. It seems that dovecot strategy handgling data output timeout when proxying LMTP is or too aggressive or may have some other problem. This error generate sometime a lot of dupicate deliveries, probably because meanwhile real server has finished delivering the mail, proxy drops the connection. Another symptom, maybe related to duplicate uid patch, is that we are receiving blank email. What may I look further? Regards Luca

2 6

[Dovecot] SASL auth and proxy
by mailing＠securitylabs.it 02 Oct '10

02 Oct '10

Hello, I'm finding a way to have a pool of smtp-auth servers in front of my actuals servers to permit relay to our customers. Now users sends emails connecting to the right IP via mail.domain.tld, with authentication. Every server has it's own user database in mysql. I'd like to have a pool of server (with round robin, ideally with postfix + sasl + dovecot) that authenticate the users with the actuals servers and then pointing mail.domain.tld to this pool and not to one server. My trouble is how to authenticate users. Can I use: http://wiki.dovecot.org/Authentication/MultipleDatabases to tell Dovecot to authenticate with every MySQL database on the servers "behind"? If yes, is there a better way to do this considering I'm already using some proxy machines (dovecot) for pop3/imap and so I already have a db with domain.tld -> IP of the server? I also have some machine without a MySQL DB for users (vpopmail + cdb), so the option with MultipleDatabases will be good only for some machines. Something similar to the proxy mechanism that I already use for pop3/imsp will be good: the proxy connect to the machine behind that do the authentication, I only need a table with domain -> server IP (that I already have). Thanks for any advice.

3 4

[Dovecot] Dovecot v0.99.13-3 upgrade to 1.0.15-2 ??
by cajun 02 Oct '10

02 Oct '10

I've read some of the mailing lists looking for information on this. Thus far, about all I've found is there was a complete rewrite of Dovecot some time back. I'm wondering now is it even possible to use the same mbox's from 0.99.13-3 with version 1.0.15-2? Is there a procedure documented somewhere? Any pointers would be much appreciated. Thanks, Mike -- Let the machine do the dirty work. - Elements of Programming Style 15:50:02 up 1 day, 1:13, 2 users, load average: 0.52, 0.45, 0.36 Linux Registered User #241685 http://counter.li.org

8 19

[Dovecot] dovecot 2.04 broke folder sharing
by Robert Schetterer 02 Oct '10

02 Oct '10

Hi Timo, upgrading from 2.03 to 2.04 broke folder sharing at my setup double checked this with tests reverting versions etc setting acl and subcriptions are working with 2.04, but in difference to 2.03 no shared subfolder is created at acl/subscription set time so subscribing afterwards fail with ignore message by bad subscription the mails store is on drbd with ocfs2 i didnt change any other config parameter during the tests so some patch must have changed folder sharing behavior from 2.03 to 2.04 speculate something with default hardlinks etc? any idea ? -- Best Regards MfG Robert Schetterer Germany/Munich/Bavaria

2 10

[Dovecot] LMTP don't accept jobs for system users
by Alejandro Maurich 01 Oct '10

01 Oct '10

Hi, I'm trying to configure Dovecot 2.0.1 to deliver email to users in /etc/passwd using the Dovecot LMTP service. So far, I can sucessufully do POP3 for system users, but when Postfix tries to deliver email to the Dovecot LMTP service the LMTP reject the job with: "User doesn't exist ale(a)centos54.mydomain.com" Any suggestions? The user 'ale' is a valid user: # grep ale /etc/passwd ale:x:500:500:Alex:/home/ale:/sbin/nologin This is the dovecot -n output: # 2.0.1: /etc/dovecot/dovecot.conf # OS: Linux 2.6.18-164.el5xen i686 CentOS release 5.4 (Final) disable_plaintext_auth = no mail_location = maildir:~/Maildir mail_privileged_group = mail mbox_write_locks = fcntl passdb { args = session=yes failure_show_msg=yes dovecot driver = pam } service lmtp { inet_listener lmtp { address = 127.0.0.1 port = 10050 } unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0660 user = postfix } } ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_key = </etc/pki/dovecot/private/dovecot.pem userdb { driver = passwd } protocol lmtp { mail_plugins = $mail_plugins }

2 1

[Dovecot] IMAP connection timeout value?
by Tamas Kadar 01 Oct '10

01 Oct '10

So we're having some ISP issues lately, meaning we have to reboot our cable modem like 2-3 times a day. An unfortunate side-effect I've found is, once the users max out their connection limit (which I've set to 10, and many people do), if we reboot the cable modem, they can't log in cause their connections get 'stuck' until I `doveadm kick` them, or wait for the connections to timeout which takes ??? minutes. Can I adjust that value to something like 30 seconds? Thanks and best regards, KT

5 8