- dovecot - dovecot.org

[Dovecot] Maildir locking by LDA of dovecot
by Mike Grozak 21 May '08

21 May '08

Hi all! First of all, I want ti thank the whole Dovecot community (developers for developing and fast responses, users for populating and responses too). Dovecot is a really good and fast IMAP server - it serves near 3000 in our installation. Now I have a problem and request community's help its resolving;) Dovecot version: 1.0.13, compiled with vpopmail support. I have an account spam(a)domain.com (:-), in which we put all our spam (we gather statistic later). There can be 10 and more delivery attempts in a second to maildir of this account during the spam attacks on our server. The queue of our server can grow up to 20k messages, and all of these messages are sent to spam(a)domain.com. I found a lot of such strings in dovecot.log file during the such DoS attack: dovecot.log:deliver(spam@domain.com): May 16 04:18:48 Info: msgid=<01c8b6da$a8bacf80$b7af2abe@sale>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:18:59 Info: msgid=<6611811842.20080516012444(a)poiusadfhnvxzmdiasdasgkhlsdkfg.com>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:20:06 Info: msgid=<01c8b6a8$7b552e00$a0a4034c@sale>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:20:14 Info: msgid=<360825920.32055246029506(a)mirgames.ru>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:20:50 Info: msgid=<01c8b6b1$0df9cb00$cc36dfc9@tek2>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:21:00 Info: msgid=<087901c7ca2d$ef272640$1e01a8c0(a)telefonia.InterCable.net>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:21:01 Info: msgid=<000701c8b6d2$01ff999f$c491aca7@snoueiij>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:22:32 Info: msgid=<000801c8b69b$060c0230$3cd8a4b7@cpbvlrx>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:22:45 Info: msgid=<000801c8b6a5$04ba6412$9910848d@aldldr>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:22:45 Info: msgid=<031401c772e2$adc5be40$1e01a8c0(a)mtu-net.ru>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:23:08 Info: msgid=<01c8b6db$0222fe80$b7af2abe@info>: save failed to INBOX: Timeout while waiting for lock My dovecot.conf: $ cat /etc/dovecot.conf | grep -v \# | grep -v ^\n protocols = imap pop3 log_path = /var/log/dovecot.log ssl_disable = yes login_user = dovecot login_process_per_connection = no login_max_connections = 1024 login_greeting = Server is ready. >>dotlock_use_excl = yes - can it be the reason? fsync_disable = yes first_valid_uid = 39 last_valid_uid = 39 first_valid_gid = 39 last_valid_gid = 39 max_mail_processes = 1024 maildir_copy_with_hardlinks = yes maildir_copy_preserve_filename = yes protocol imap { mail_plugins = quota imap_quota login_greeting_capability = yes imap_client_workarounds = outlook-idle } protocol pop3 { pop3_lock_session = no pop3_uidl_format = %08Xu%08Xv mail_plugins = quota } protocol lda { postmaster_address = postmaster(a)tversu.ru mail_plugins = quota cmusieve sendmail_path = /usr/lib/sendmail fsync_disable = no } auth_cache_size = 10240 auth_username_format = %Lu auth default { mechanisms = plain login cram-md5 socket listen { master { path = /var/run/dovecot/auth-master mode = 0666 } client { path = /var/spool/postfix/private/auth mode = 0666 user = postfix group = postfix } } passdb vpopmail { args = cache_key=%u dovecot } userdb vpopmail { } user = vpopmail ssl_require_client_cert = no } dict { } plugin { quota = maildir:ignore=Trash } What can I do for resolving this locks? May be, while looking into uidlist file, can dovecot LDA lock it? And other deliver processes can't open it and wait for him? --------------------------- WBR, Mike Grozak, TvSU IC

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[Dovecot] Running sieve filters on already delivered mails
by Axel Gembe 20 May '08

20 May '08

I want to know what the best way to run sieve filters on already delivered mail is. Problem is that I have a rather large unfiltered mailbox and filtering it by hand would be a PITA. I don't mind coding something up to do this, but I just don't think that I'm the first one with this problem. Thanks - Axel

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[Dovecot] Cannot compile current version of antispam
by Steffen Kaiser 20 May '08

20 May '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello, with the current (2008-05-20) repository releases of Dovecot-1.0 and antispam the plugin no longer compiles: antispam-storage-1.0.c: In function âantispam_mail_update_keywordsâ: antispam-storage-1.0.c:285: error: âidxkwd__typeâ undeclared (first use in this function) antispam-storage-1.0.c:285: error: (Each undeclared identifier is reported only once antispam-storage-1.0.c:285: error: for each function it appears in.) antispam-storage-1.0.c:285: warning: type defaults to âintâ in declaration of âtype nameâ antispam-storage-1.0.c:285: warning: initialization from incompatible pointer type Version of antispam: (first entry of git log) commit c3a343290773d6e22a08946cb2ef80b1b8fe8a06 Author: Johannes Berg <johannes(a)sipsolutions.net> Date: Sat Apr 26 20:34:06 2008 +0200 add 1.1 storage. probably doesn't work Base version of Dovecot: changeset: 5551:71c02fdf1b59 branch: branch_1_0 tag: tip Bye, - -- Steffen Kaiser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFIMtunVJMDrex4hCIRAjXgAJ9j0oNUa0wGaLMshw6F/kjQoQxvygCdHLE9 Vb7rUcHxSr1kcgN+MHCsI1U= =dBuy -----END PGP SIGNATURE-----

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[Dovecot] New ManageSieve releases: v0.10.2 for Dovecot 1.1.rc4 and v9.3 for Dovecot 1.0.13
by Stephan Bosch 20 May '08

20 May '08

Hello Dovecot users, Recently, I was pointed towards a problem in the managesieve SASL implementation. As it turns out there was a bug in handling mechanisms that expect more than a single client response. That is why the PLAIN mechanism works and the (obsolete) LOGIN mechanism fails (along with probably many others). This problem was present in both v9.2 and v0.10.1 for Dovecot 1.0 and 1.1 respectively. This issue is fixed in the new releases: Change Log v9.3/v0.10.2 ------------------------ * Fixed bug that caused SASL mechanisms that require more than a single client response to fail. Reported by Steffen Kaiser and occured when he tried using the (obsolete) LOGIN mechanism. * Updated installation and configuration documentation to match the information provided in the wiki Installation ------------ The full installation procedure and other relevant information regarding ManageSieve is finally available on the Dovecot wiki at: http://wiki.dovecot.org/ManageSieve New releases: 1.0: (patch) http://www.rename-it.nl/dovecot/1.0/dovecot-1.0.13-MANAGESIEVE-v9.3.diff.gz http://www.rename-it.nl/dovecot/1.0/dovecot-1.0.13-MANAGESIEVE-v9.3.diff.gz… 1.1: (package + patch) http://www.rename-it.nl/dovecot/1.1/dovecot-1.1-managesieve-0.10.2.tar.gz http://www.rename-it.nl/dovecot/1.1/dovecot-1.1-managesieve-0.10.2.tar.gz.s… http://www.rename-it.nl/dovecot/1.1/dovecot-1.1.rc4-managesieve-0.10.2.diff… http://www.rename-it.nl/dovecot/1.1/dovecot-1.1.rc4-managesieve-0.10.2.diff… (my public key (id: 3DFBB4F4) can be found at wwwkeys.pgp.net) Have fun testing the Dovecot ManageSieve service. Don't hesitate to notify me when there are problems. Regards, -- Stephan Bosch stephan(a)rename-it.nl IRC: Freenode, #dovecot, S[r]us

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[Dovecot] Looking for suggestions: How to strip attachments from mails
by Patrick Nagel 20 May '08

20 May '08

Hi, I know this is not 100% on-topic, but I'll try anyway... I'm looking for a way to strip attachments from incoming mails on the server. The attachments should be stored on a file server (where users have access via SAMBA) and only a link to the file (UNC path) should remain in the mail body. This is to prevent the mail storage from filling up with a large amount of big mails where at the same time the 'payload' (attached file) is not conveniently accessible by the users. The current setup is postfix / dovecot deliver / dovecot (with sieve plugin). I'm considering piping the mails through something like mimeStrip.pl (http://freshmeat.net/projects/mimestrip.pl/) but therefore I'd probably need to bring procmail/maildrop into the game, right? Or are there other (better) ways to accomplish this? Patrick. -- STAR Software (Shanghai) Co., Ltd. http://www.star-group.net/ Phone: +86 (21) 5427 7799 x 826 Fax: +86 (21) 6485 0071 PGP key: https://stshacom1.star-china.net/keys/patrick_nagel.asc Fingerprint: E09A D65E 855F B334 E5C3 5386 EF23 20FC E883 A005

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[Dovecot] RFC 3516 - IMAP4 Binary Content Extension
by Anton Yuzhaninov 20 May '08

20 May '08

Is Binary Content Extension (rfc3516) support planned? -- WBR, Anton Yuzhaninov

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[Dovecot] child process killed with signal 11
by Zbigniew Szalbot 20 May '08

20 May '08

Hello, Today I have noticed such log entries May 19 23:57:32 relay dovecot: child 40857 (imap) killed with signal 11 I am using v. 1.0.13. Any idea what can be wrong? Dovecot does not die. It seems child processes are being killed. Thanks! -- Zbigniew Szalbot www.lc-words.com

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[Dovecot] messages downloading repeatedly to mozilla/seamonkey pop3 client
by Ben Julian 20 May '08

20 May '08

Hello Dovecot List, I am a bit of a sysadmin novice and this is my first time emailing, so please let me know if I have left some critical information out. I am supporting a small office network supported primarily by linux servers. All of my users are using dovecot as a pop3 daemon on a centOS 5 box, no IMAP users. Seven users are running outlook 2003 on windows XP, two users are running thunderbird on ubuntu, two are running evolution on ubuntu, and one is running mozilla seamonkey on XP. Emails to the mozilla/seamonkey user are downloading multiple times, but not to any of the other users. A typical maillog report following this user's mail client pop3 login: Mar 3 10:37:00 servername dovecot: pop3-login: Login: user=<user>, method=PLAIN, rip=::ffff:192.168.99.13, lip=::ffff:192.168.99.4 Mar 3 10:37:00 servername dovecot: POP3(user): mbox sync: UID inserted in the middle of mailbox /var/mail/user (84873 > 84872, seq=2, idx_msgs=3) Mar 3 10:37:01 servername dovecot: POP3(user): mbox sync: UID inserted in the middle of mailbox /var/mail/user (84877 > 84872, seq=2, idx_msgs=4) Mar 3 10:37:01 servername dovecot: POP3(user): Disconnected: Logged out top=0/0, retr=1/3364, del=1/1, size=3347 Things I've tried: *adding the following lines to dovecot.conf: protocol pop3 { pop3_uidl_format = %08Xu%08Xv pop3_client_workarounds = outlook-no-nuls oe-ns-eoh } *deleting the user's homedir mail directory (including all dovecot index files) *restarting dovecot *changing mail clients: tried outlook express, netscape 4.8, thunderbird on user's PC *restarting the server All changes resulted in only a brief (1-2hr) cessation of the problem. I've subscribed for a month or so now and searched the archives, but if I missed a solution to this in there, I apologize. Thanks, Ben Julian

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[Dovecot] Webmail Recommendation
by Peter Sparkes 19 May '08

19 May '08

Hi, I want to install webmail. I am using Dovecot with Exim4. Recommendations requested please. Thanks Peter Sparkes

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[Dovecot] Fixed a Duplicate?
by Nigel Allen 19 May '08

19 May '08

Greetings We have recently switched from mbox to Maildir so that we can implement symlinks for a large email account that is shared (partially) between some 20 or so users. The setup is dovecot-1.0.3-6.fc6, procmail-3.22-17.1, sendmail-8.13.8-2. Procmail has a single recipe in /etc/procmailrc that simply says "DEFAULT=$HOME/Maildir/". The problem is that I am seeing a lot of blank emails being created. For exaample, every time I open a folder from this shared account, I get either one or two emails being created on the spot. The are /always/ created with the current date and time stamp (i.e. now) and at the same time a tail -f of maillog shows something like this: > May 19 09:10:05 sydsrv56 dovecot: IMAP(plans): Fixed a duplicate: > dovecot-shared:2, -> 1211152205.P10039Q1.sydsrv56 The only thing that appears to change is the last modified date and time of the two files, dovecot.index.log and dovecot.index.cache. Should I be maintaining separate index files or lock files for each user in this shared account? Currently the Maildir is shared and has the g+s bit set. Any ideas where I can start looking would be appreciated. Rgds Nigel. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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