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Pop3 service stops responding
by Mike Eriksson 02 Jun '15

02 Jun '15

Hi! I have problem with the pop3 service stops responding at random intervals on my server. We started to notice this problem as we're running icinga to check the imap & pop3 service. When icinga reports that the service is down. We try to telnet to the server on port 110 but it refuses the connection. I've checked the netstat during this time and it's listens on port 110. My first thought we were hitting the max connections and similar. Changed login_max_connections from 128 to 256. Didnt solve the problem. Started the debug on the dovecot server but could not see anything in the logs. Also the error log or the syslog dosnt report anything that I can see. Best thing would of course be to start and upgrade the software and os(Debian 5) but I'm not comfortable upgrading it at the moment as my knowledge about dovecot / postfix isn't great. Do you have any idéas how to move forward? dovecot -n # 1.0.15: /etc/dovecot/dovecot.conf base_dir: /var/run/dovecot/ log_path: /var/log/dovecot-error.log info_log_path: /var/log/dovecot-info.log log_timestamp: %Y-%m-%d %H:%M:%S protocols: pop3 imap imaps pop3s ssl_cipher_list: ALL:!LOW disable_plaintext_auth: no login_dir: /var/run/dovecot//login login_executable(default): /usr/lib/dovecot/imap-login login_executable(imap): /usr/lib/dovecot/imap-login login_executable(pop3): /usr/lib/dovecot/pop3-login login_max_processes_count: 256 first_valid_uid: 1090 last_valid_uid: 1090 first_valid_gid: 1090 last_valid_gid: 1090 mail_privileged_group: mail mail_location: maildir:~/Maildir mail_executable(default): /usr/lib/dovecot/imap mail_executable(imap): /usr/lib/dovecot/imap mail_executable(pop3): /usr/lib/dovecot/pop3 mail_plugins(default): quota imap_quota mail_plugins(imap): quota imap_quota mail_plugins(pop3): quota mail_plugin_dir(default): /usr/lib/dovecot/modules/imap mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3 pop3_uidl_format(default): pop3_uidl_format(imap): pop3_uidl_format(pop3): %08Xu%08Xv auth default: username_chars: abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@% username_translation: %@ username_format: %Lu passdb: driver: sql args: /etc/dovecot/dovecot-sql.conf userdb: driver: passwd userdb: driver: sql args: /etc/dovecot/dovecot-sql.conf socket: type: listen client: path: /var/spool/postfix/private/auth mode: 432 user: postfix group: postfix master: path: /var/run/dovecot/auth-master mode: 384 user: vmail group: vmail plugin: quota: maildir sieve_global_path: /etc/dovecot/sieve_scripts/spam-sort.sieve login_max_processes_count: 256 login_max_connections: 256 max_mail_processes: 1024 Best Regards Mike

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Failed running extprograms execute via socket - fatal recv(MSG_PEEK) failed disconnected
by E.B. 01 Jun '15

01 Jun '15

I switched from running my extprograms execute script directly to running with dovecot socket. Log shows only this dovecot: lmtp(test(a)example.com): Debug: wdi0Tb5VPlGfPnEAM/SpMA: sieve: action execute: running program: test dovecot: lmtp(test(a)example.com): Debug: Namespace : Using permissions from /vmail/example.com/test: mode=0770 gid=default dovecot: script: Fatal: recv(MSG_PEEK) failed: disconnected For testing I opened up the script and socket with permissions 777 but the error seems to indicate less about permissions more about some kind of protocol problem i guessing. Sieve script calls using this: execute "test"; Plugin config: plugin { sieve_plugins = sieve_extprograms sieve_global_extensions = +vnd.dovecot.execute sieve_execute_socket_dir = sieve-execute sieve_before = /usr/local/etc/dovecot/sieve } service test { executable = script /usr/local/etc/dovecot/sieve_globals/test.sh unix_listener sieve-execute/test { mode = 0660 group = vmail } } FYI I have quota-warning sockets configured identical to this and they work good. Dovecot 2.2.16 Pigeonhole 0.4.7 Help appreciate a lot.

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Sieve extprograms ?not exexuting?
by E.B. 01 Jun '15

01 Jun '15

Hello, I was testing the extprograms plugin. I think I had it working in the past, but many things have changed since then, so no use trying to figure out where it broke - starting over again... Debug-enabled log give me: Apr 27 04:11:36 mail dovecot: lmtp(test(a)example.com): Debug: qOGyA0DePHVaOyHEM/SpMA: sieve: action execute: running program: test.sh Apr 27 04:11:36 mail dovecot: lmtp(test(a)example.com): Debug: waiting for program `/usr/local/etc/dovecot/sieve_globals/test.sh' to finish after 0 seconds So I guess it thinks it is running my script? But simple test script does nothing. Here it is: #!/bin/sh read INPUT INPUT="Hello world: $INPUT" echo "$INPUT" >> /tmp/hello echo "---------------------------" >> /tmp/hello Permissions on this script file for now are rwxrwxrwx But nothing goes to /tmp/hello at all. Script works when I run it manually. I also tried without the "read" but I think that's required isn't it? Anyway, what else can I do to debug this? Dovecot 2.2.16 Pigeonhole 0.4.7

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OT: Central sieve management
by list＠airstreamcomm.net 29 May '15

29 May '15

A bit off topic, but I was wondering if anyone here has a solution for centrally managing sieve for multiple users from a custom web application? We would like to implement pigeonhole sieve on our dovecot cluster, however we need to be able to access user’s sieve configurations from a central location for troubleshooting and support purposes.

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Enabling Master User for migration
by Charles Marcus 29 May '15

29 May '15

Hi all, Ok, just need a quick-n-dirty way to enable a master user for a migration... Reading the docs, I'm not sure what the bare minimum is I need to do this... At: http://wiki2.dovecot.org/Authentication/MasterUsers The Example config shows: auth_master_user_separator = * passdb { driver = passwd-file args = /etc/dovecot/passwd.masterusers master = yes pass = yes } passdb { driver = shadow } userdb { driver = passwd } But, if I'm using a non-real user (just need a master user that can log in as all other users for the migration), do I need all three of these? Or just the first two? Or, just the first one? I think I need the first two and not the last one, but am unsure. This is on a production system so don't want to break things, and I'm unfamiliar with using multiple passdb's... Thanks, Charles

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Shared inbox?
by Chris Ross 29 May '15

29 May '15

I'm running dovecot 2.2.16 on my FreeBSD mail server. I've read information on the wiki about setting up shared mailboxes, but I want to do something that isn't really coved by the instructions I was reading there. My son (now 7 years old) has an account on the system, but doesn't use it directly. But, for things he's interested in like Minecraft, and/or the local zoo, we have given out his email address in a small number of places. What I would like to set up, both for now while he's not actually ever reading his email himself, and perhaps even for the future when we teach and/or allow for that, is for my wife and I to be able to "view" his inbox from our accounts. The instructions for setting up shared folders all are written so that they're secondary folders to all accounts. Is there a way to either (a) configure sharing someone elses Inbox by other accounts, or (b) setting up a separately configured shared folder to _act_ as the inbox for a single account? Thanks. Any suggestions to achieve the above described end goal would be appreciated. - Chris

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Creating IMAP folders/subfolders with Thunderbird
by Alex Regan 29 May '15

29 May '15

Hi, I have dovecot-2.2.15 on fedora21 with Thunderbird and having some difficulty creating subfolders and deleting folders. Creating subfolders results in a folder at the root with a caret instead of a slash called folder^subfolder with an entry in .subscriptions with that name, instead of a new folder under the directory. I'm also unable to delete any folders. The command from within Thunderbird is just completely ignored. Any idea what's happening here? Thanks, Alex

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X-UID in mail header is removed?
by mkawada＠redhat.com 28 May '15

28 May '15

Dear Dovecot Mailing List, I have 2 questions regarding dovecot and would very much appreciate if you would kindly give me helps. <Question 1> Is 'X-UID' no longer shown in mail header via pop3? I have checked with the following 3 version of dovecot packages in order to make sure if a message sent by dovecot have 'X-UID' in its mail header, and the result is that only "dovecot-0.99.11-10.EL4" shows 'X-UID' and the other ones do not(Please see the result written in the second half of this mail). <Question 2> Is 'X-UID' used for checking if a message has already been sent to a user so that he never gets any duplicated mails that are already in his mbox? The reason why I am asking this here is that I am working on a problem that a user sometimes gets a duplicated mail from dovecot if the user keeps mails on the server as its settings. I actually thought this kind of thing would happen if the 'UIDL' gets corrupted or changed for some reasons. However, it is said that this issue never happened in using "dovecot-0.99.11-10.EL4" which shows 'X-UID' in mail header and in using "dovecot-2.0.9-8.el6_6.4" which does not show 'X-UID', the issue happens sometimes. Thus, I would like information indicating what is exactly used to avoid getting any duplicated messages while downloading a message via pop3 from dovecot. Here is the test result I checked: (dovecot-0.99.11-10.EL4) ]# telnet localhost 110 Trying 127.0.0.1... Connected to localhost.localdomain (127.0.0.1). Escape character is '^]'. +OK dovecot ready. user test +OK pass password +OK Logged in. list +OK 1 messages: 1 786 . RETR 1 +OK 786 octets Return-Path: <root(a)localhost.localdomain> Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by localhost.localdomain (8.13.1/8.13.1) with ESMTP id t4S4dBcu006057 for <test(a)localhost.localdomain>; Thu, 28 May 2015 13:39:11 +0900 Received: (from root@localhost) by localhost.localdomain (8.13.1/8.13.1/Submit) id t4S4dB6u006056 for test; Thu, 28 May 2015 13:39:11 +0900 Date: Thu, 28 May 2015 13:39:11 +0900 From: root <root(a)localhost.localdomain> Message-Id: <201505280439.t4S4dB6u006056(a)localhost.localdomain> To: test(a)localhost.localdomain Subject: test mail X-IMAPbase: 1432787986 1 Status: O X-UID: 1 <--X-UID shown here Content-Length: 5 X-Keywords: test . UIDL +OK 1 1432787986.1 (dovecot-1.0.7-9.el5_11.4) ]# telnet localhost 110 Trying 127.0.0.1... Connected to localhost.localdomain (127.0.0.1). Escape character is '^]'. +OK Dovecot ready. user test +OK pass password +OK Logged in. list +OK 1 messages: 1 606 . RETR 1 +OK 606 octets Return-Path: <root(a)localhost.localdomain> Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by localhost.localdomain (8.13.8/8.13.8) with ESMTP id t4S27gBo007199 for <test(a)localhost.localdomain>; Thu, 28 May 2015 11:07:42 +0900 Received: (from root@localhost) by localhost.localdomain (8.13.8/8.13.8/Submit) id t4S27fXd007197 for test; Thu, 28 May 2015 11:07:41 +0900 Date: Thu, 28 May 2015 11:07:41 +0900 From: root <root(a)localhost.localdomain> Message-Id: <201505280207.t4S27fXd007197(a)localhost.localdomain> To: test(a)localhost.localdomain Subject: testmail test . UIDL +OK 1 0000000155667888 . (dovecot-2.0.9-8.el6_6.4) ]# telnet localhost 110 Trying ::1... telnet: connect to address ::1: Connection refused Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. +OK Dovecot ready. user test +OK pass password +OK Logged in. list +OK 1 messages: 1 605 . RETR 1 +OK 605 octets Return-Path: <root(a)localhost.localdomain> X-Original-To: test Delivered-To: test(a)localhost.localdomain Received: by localhost.localdomain (Postfix, from userid 0) id 3629F4336A; Wed, 27 May 2015 11:34:39 +0900 (JST) Date: Wed, 27 May 2015 11:34:39 +0900 To: test(a)localhost.localdomain Subject: test mail User-Agent: Heirloom mailx 12.4 7/29/08 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <20150527023439.3629F4336A(a)localhost.localdomain> From: root(a)localhost.localdomain (root) test . UIDL +OK 1 0000000155652c77 Thanks, Masaharu Kawada

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Re: FREAK/Logjam, and SSL protocols to use
by Jacques Distler 27 May '15

27 May '15

> For a given computational effort, you get the most bang-for-the-buck by > choosing large parameters (and checking very carefully that they are > "safe") rather than smaller parameters (and/or checking them less > carefully) which you then regenerate. This discussion (on the OpenSSH mailing list) http://marc.info/?t=143221614200001 may be helpful to those thinking about this.

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Re: FREAK/Logjam, and SSL protocols to use
by Jacques Distler 27 May '15

27 May '15

>But when you write NOT to regenerate, are you saying that using larger primes makes regenerating unnecessary, or are you telling us that it's somehow harmful? For a given computational effort, you get the most bang-for-the-buck by choosing large parameters (and checking very carefully that they are "safe") rather than smaller parameters (and/or checking them less carefully) which you then regenerate. Every time you regenerate, there's a small (but finite) probability that the new parameters are actually unsafe. You'd do better using those CPU cycles to improve the proof that your original set of parameters was safe (admittedly, no one actually does this), rather than generating a new set. Remember, the DH parameters (p,g) are NOT secret; they are transmitted in the clear everytime. As long as you're using Ephemeral Diffie-Hellman (choosing new exponents, a and b, for each session) with large safe DH parameters, it's hard to think of a threat model where you improve the security AT ALL by regenerating the DH parameters.

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