January 2016 - dovecot

Released Pigeonhole v0.4.12.rc1 for Dovecot v2.2.21
by Stephan Bosch 27 Jan '16

27 Jan '16

Hello Dovecot users, The last few releases had an annoying bug that made the Sieve editheader and imap4flags ineffective when multiple scripts were executed sequentially (sieve_before/sieve_after). That is why I am making a new release. Unlike the previous release, this release also adds a new feature: support for the Sieve extracttext extension. Changelog v0.4.12: + Implemented the Sieve extracttext extension (RFC 5703; Section 7). It is now possible to extract body text from a message into a variable. * Increased ABI version due to changes in the Sieve interpreter's object definitions. - multiscript: Fixed bug in handling of (implicit) keep; final keep action was always executed as though there was a failure. This caused the keep action to revert back to the initial message, causing editheader actions to be ignored. - managesieve-login: Fixed proxy to allow SASL mechanisms other than PLAIN. Before, the proxy would fail if the server did not support the PLAIN mechanism. - ldap storage: Prevent segfault occurring when assigning certain (global) configuration options. The release is available as follows: http://pigeonhole.dovecot.org/releases/2.2/rc/dovecot-2.2-pigeonhole-0.4.12… http://pigeonhole.dovecot.org/releases/2.2/rc/dovecot-2.2-pigeonhole-0.4.12… Refer to http://pigeonhole.dovecot.org and the Dovecot v2.x wiki for more information. Have fun testing this release candidate and don't hesitate to notify me when there are any problems. Regards, -- Stephan Bosch stephan(a)rename-it.nl

1 0

dsync: INBOX Can't be deleted
by Christoph Adomeit 26 Jan '16

26 Jan '16

Hi, I am Migrating an old cyrus mailserver to dovecot. in the old cyrus Mailserver all User Mailboxes are sub-mailboxes of their INBOX. I have to preserve that structure. During Migration with dsync I get these Errors: Error: Mailbox INBOX sync: mailbox_delete failed: INBOX can't be deleted Is there a way to work around these Errors ? Thanks Christoph

5 11

problem Dovecot 2.2.13 does not send the information on ending the quota to user
by gothic-folk＠mail.ru 25 Jan '16

25 Jan '16

Hi. I have Dovecot + Postfix + MySQL. Version of Postix: 2.11.3-1 Version of Dovecot: 2.2.13 Operations system is: Debian GNU/Linux 8.2 (jessie) Postfix have patched (patch VDA - http://vda.sourceforge.net) for using with quota, it means that file "maildirsize" in mail directory already exists and changed when add/delete mail. Quota for virtual box take in MySQL db. ########################## Problem: Dovecot does not send the information on ending the quota to user. ########################## # 2.2.13: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-042stab112.15 x86_64 Debian 8.2 ext4 auth_debug = yes auth_default_realm = mydomain.ru auth_mechanisms = plain login auth_realms = mydomain.ru debug_log_path = /var/log/dovecot-debug.log info_log_path = /var/log/dovecot.log lda_mailbox_autocreate = yes lda_mailbox_autosubscribe = yes log_path = /var/log/dovecot.log login_greeting = Welcome mydomain.ru" mail_debug = yes mail_gid = 1000 mail_location = maildir:/var/vmail/%n@%d mail_plugins = " quota" mail_uid = 1000 managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii- numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave namespace inbox { inbox = yes list = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = type = private } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { quota = maildir:User quota quota_rule = *:storage=10M quota_rule2 = Trash:storage=+100M quota_rule3 = SPAM:ignore quota_warning = storage=90%% quota-warning 90 %u quota_warning2 = storage=80%% quota-warning 80 %u } protocols = pop3 imap quota_full_tempfail = yes service auth { unix_listener /var/spool/postfix/private/dovecot-smtp-auth { group = postfix mode = 0666 user = postfix } unix_listener auth-userdb { group = vmail mode = 0600 user = vmail } } service imap-login { inet_listener imap { port = 143 } inet_listener imaps { port = 993 ssl = yes } } service pop3-login { inet_listener pop3 { port = 110 } inet_listener pop3s { port = 995 ssl = yes } } service quota-warning { executable = script /etc/dovecot/quota.sh unix_listener quota-warning { user = vmail } user = vmail } ssl_cert = </etc/ssl/mydomain.ru.crt ssl_key = </etc/ssl/mydomain.ru.key userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol imap { mail_plugins = " quota imap_quota" } protocol pop3 { mail_plugins = quota } protocol lda { mail_plugins = " quota" } ##### quota.sh ##### #!/bin/sh PERCENT=$1 USER=$2 cat << EOF | /usr/lib/dovecot/dovecot-lda -d $USER -o "plugin/quota=maildir:User quota:noenforcing" From: aaa(a)mydomain.ru Subject: Quota warning $PERCENT% Your mailbox is now $PERCENT% full. Please remove unnecessary emails to avoid new mail loosing. EOF ##### Script has chmod 777 ##### root@mx:~# ls -la /etc/dovecot/quota.sh -rwxrwxrwx 1 vmail vmail 570 Jan 25 17:26 /etc/dovecot/quota.sh Check the script this command is successful: # /etc/dovecot/quota.sh 82 rrr(a)mydomain.ru (a letter is sent to rrr(a)mydomain.ru that box is filled to 82%) ##### dovecot-sql.conf.ext ##### driver = mysql connect = host=localhost dbname=postfix user=postfix password=xxxxxxx default_pass_scheme = MD5-CRYPT user_query = SELECT '/var/vmail/%n@%d' as home, 'maildir:/var/vmail/%n@%d'as mail, 1000 AS uid, 1000 AS gid, concat ('*:bytes=', quota) AS quota_rule FROM mailbox WHERE username = '%u' AND active = '1' password_query = SELECT username as user, password, '/var/vmail/%n@%d' as userdb_home, 'maildir:/var/vmail/%n@%d' as userdb_mail, 1000 as userdb_uid, 1000 as userdb_gid, concat('*:bytes=', quota) AS userdb_quota_rule FROM mailbox WHERE username = '%u' AND active = '1' ##### Check that the socket has a quota-warning: # lsof |grep quota-warning dovecot 28972 root 57u unix 0xffff8801861f7400 0t0 216184427 /var/run/dovecot/quota- warning ##### Verify that the plugin quota is running I doing like this: # doveadm -D -v quota get -u rrr(a)mydomain.ru Conclusion: doveadm(root): Debug: Loading modules from directory: /usr/lib/dovecot/modules doveadm(root): Debug: Module loaded: /usr/lib/dovecot/modules/lib10_quota_plugin.so doveadm(root): Debug: Loading modules from directory: /usr/lib/dovecot/modules/doveadm doveadm(root): Debug: Skipping module doveadm_acl_plugin, because dlopen() failed: /usr/lib/dovecot/modules/doveadm/lib10_doveadm_acl_plugin.so: undefined symbol: acl_user_module (this is usually intentional, so just ignore this message) doveadm(root): Debug: Skipping module doveadm_expire_plugin, because dlopen() failed: /usr/lib/dovecot/modules/doveadm/lib10_doveadm_expire_plugin.so: undefined symbol: expire_set_deinit (this is usually intentional, so just ignore this message) doveadm(root): Debug: Module loaded: /usr/lib/dovecot/modules/doveadm/lib10_doveadm_quota_plugin.so doveadm(root): Debug: Module loaded: /usr/lib/dovecot/modules/doveadm/lib10_doveadm_sieve_plugin.so doveadm(root): Debug: Skipping module doveadm_fts_lucene_plugin, because dlopen() failed: /usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_lucene_plugin.so: undefined symbol: lucene_index_iter_deinit (this is usually intentional, so just ignore this message) doveadm(root): Debug: Skipping module doveadm_fts_plugin, because dlopen() failed: /usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_plugin.so: undefined symbol: fts_backend_rescan (this is usually intentional, so just ignore this message) doveadm(asd(a)mydomain.ru): Debug: auth input: asd(a)mydomain.ru home=/var/vmail/asd(a)mydomain.ru mail=maildir:/var/vmail/asd@mydomain.ru uid=1000 gid=1000 quota_rule=*:bytes=5120000 doveadm(asd(a)mydomain.ru): Debug: Added userdb setting: mail=maildir:/var/vmail/asd@mydomain.ru doveadm(asd(a)mydomain.ru): Debug: Added userdb setting: plugin/quota_rule=*:bytes=5120000 doveadm(asd(a)mydomain.ru): Debug: Effective uid=1000, gid=1000, home=/var/vmail/asd(a)mydomain.ru doveadm(asd(a)mydomain.ru): Debug: Quota root: name=User quota backend=maildir args= doveadm(asd(a)mydomain.ru): Debug: Quota rule: root=User quota mailbox=* bytes=5120000 messages=0 doveadm(asd(a)mydomain.ru): Debug: Quota rule: root=User quota mailbox=Trash bytes=+104857600 messages=0 doveadm(asd(a)mydomain.ru): Debug: Quota rule: root=User quota mailbox=SPAM ignored doveadm(asd(a)mydomain.ru): Debug: Quota warning: bytes=4608000 (90%) messages=0 reverse=no command=quota-warning 90 asd(a)mydomain.ru doveadm(asd(a)mydomain.ru): Debug: Quota warning: bytes=4096000 (80%) messages=0 reverse=no command=quota-warning 80 asd(a)mydomain.ru doveadm(asd(a)mydomain.ru): Debug: Quota grace: root=User quota bytes=512000 (10%) doveadm(asd(a)mydomain.ru): Debug: Namespace inbox: type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes, subscriptions=yes location=maildir:/var/vmail/asd@mydomain.ru doveadm(asd(a)mydomain.ru): Debug: maildir++: root=/var/vmail/asd(a)mydomain.ru, index=, indexpvt=, control=, inbox=/var/vmail/asd(a)mydomain.ru, alt= Quota name Type Value Limit % User quota STORAGE 4852 5000 97 User quota MESSAGE 10 - 0 ##### Those plugin is successfully loaded and checked. When removing/receiving emails percent of employment, respectively changes. I read in dovecot manual, that the notification send only when the quota border crossing - then I tested like this: Clears the box up to 60% and then send letters, which occupy about 5% more of allocated quota. And so the lead up to 95%. But reports of ending the quota not be sent. In what may be another problem? Thanks. ------------------ Serg

1 0

[Bug/Enhancement] doveadm user ignores -f option when performing a wildcard search
by Haravikk 25 Jan '16

25 Jan '16

The title mostly says it all on this one, but it seems that doveadm user has unique behaviour when a wildcard username is given, causing it to return a list of matching usernames in place of regular output, ignoring other command line options such as the -f (field) option. For example, I had hoped to use the following command in a script to easily get a list of all user home locations (excluding local users): doveadm user -f home *@* However the results are a list of usernames, rather than a list of home locations as I had hoped. I’ve tagged this thread as Bug/Enhancement as outputting a list of matched usernames is clearly the intended behaviour, but it could certainly be clarified, as could the fact that the -f option is ignored in this special case. I think that the correct “fix” here is to clarify in the documentation that wildcard matching is a separate use-case of this command in which the -f (and possibly other?) options are ignored and the results are always given as a list of matching usernames. It needs to be clear that doveadm user user(a)domain1.tld user(a)domain2.tld and doveadm user *@* are not equivalent, even if those are the only two users, as this differs from many other unix commands where wildcards are permitted, e.g- using rm with a wildcard is equivalent to adding all matching files to the command yourself. However, in future I’d like to see support for the -f option with wildcard matches as well, with -f user simply being the default. This would be much easier for a script inspecting user home directories, as for now my alternative is to use the wildcard match to get a list of names, then call dovecot user -f home <user> for each one to get their home location, which isn’t nearly as nice =) - Haravikk

1 0

Mailbox doesn't exist: test
by ＠lbutlr 25 Jan '16

25 Jan '16

I’ve been getting an error when trying to save mail based on address extensions where dovecot is not creating the mailbox: dovecot: lda(user(a)example.com): msgid=<Balhs-user(a)example.net>: save failed to open mailbox test: Mailbox doesn't exist: test Is this is as simple as adding lda_mailbox_autocreate = yes to my conf file, and does it go at the ‘top’ level of the file, or does it need to be in some sort of clause? -- There is something to be said for grace and respect but humour alway helps - Toby Morris

2 1

Problem (bug?) copying mail folders
by Keith Edmunds 24 Jan '16

24 Jan '16

I have reported a bug to Claws Mail (http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3601) however, I see some behaviour from Dovecot that looks odd to me. Background: I am trying to copy a folder to another part of the IMAP folder hierarchy. The destination parent folder is ACL protected; I have lirwstpeak rights. Claws initially tries to create the destination folder and then copy the mails from the source to destination. The destination parent folder is 'public/accounts'; the folder being moved there is 'test' and 'public/accounts/test' does not exist at the start of the process. This is from Dovecot's rawlog: 11 LIST "" "public/accounts/test" 11 OK List completed. 12 CREATE "public/accounts/test" 12 OK Create completed. 13 LIST "" "public/accounts/test" 13 OK List completed. 14 SUBSCRIBE "public/accounts/test" 14 NO Mailbox doesn't exist: public/accounts/test 15 UID COPY 1:2 "public/accounts/test" 15 NO [TRYCREATE] Mailbox doesn't exist: public/accounts/test What I don't understand: the response to command 12 suggests that the destination folder has been created; the response to commands 14 and 15 suggest it hasn't. At the completion of the process, the 'public/accounts/test' folder DOES exist, but it's empty, supporting the fact that it may not have existed when command 15 was executed. Is there some kind of race condition here - or have I just misunderstood how this should work? ------------------------------------------------------------ Running on ext4 filesystem; dovecot -n: # 2.2.13: /etc/dovecot/dovecot.conf # OS: Linux 3.16.0-4-amd64 x86_64 Debian 8.2 ext4 lda_mailbox_autocreate = yes mail_debug = yes mail_location = maildir:/srv/mail/imap/%u:LAYOUT=fs mail_plugins = acl fts managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave namespace { hidden = no location = maildir:/srv/mail/imap/public:INDEX=/srv/mail/imap/public.indexes/%u.index:LAYOUT=fs prefix = public/ separator = / subscriptions = no type = public } namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / } passdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { acl = vfile acl_shared_dict = file:/srv/mail/imap/shared-mailboxes fts_autoindex = yes sieve = /home/sieve/%u.sieve sieve_dir = /home/sieve/%u } protocols = " imap sieve sieve" service imap { executable = imap postlogin } service managesieve-login { inet_listener sieve { port = 4190 } } service postlogin { executable = script-login -d rawlog } ssl_cert = </etc/dovecot/dovecot.pem ssl_dh_parameters_length = 4096 ssl_key = </etc/dovecot/private/dovecot.pem ssl_protocols = !SSLv2 !SSLv3 userdb { args = uid=imapmail gid=imapmail default_fields = home=/dev/shm/%u driver = static } protocol lda { mail_plugins = acl fts sieve } protocol imap { mail_max_userip_connections = 20 mail_plugins = acl fts imap_acl } -- "Why does God hate me so much? Is it because I don't believe in him?" - Sidney Morgenbesser

2 1

sql delete problem
by Tóth Csaba 24 Jan '16

24 Jan '16

Dear List! I have a dovecot installment with postgresql based user management. My problem is i see this in postgresql's log file: root@c13:/var/lib/postgresql/9.4/main/pg_log# cat postgresql-2016-01-24_12.log | grep 26105 2016-01-24 16:34:43 CET [26105-1] maildata@mail ERROR: permission denied for relation i3sysadm_email_account 2016-01-24 16:34:43 CET [26105-2] maildata@mail STATEMENT: DELETE FROM i3sysadm_email_account WHERE userid = 'account(a)mydomain.com' This is the error message from dovecot side (i have a lot, so this is from another date): root@c10:/var/log/dovecot# cat mail.log | grep "Jan 24 17:41:29" Jan 24 17:41:29 dict: Info: pgsql(127.0.0.1): Disconnected from database, retrying commit Jan 24 17:41:29 dict: Error: sql dict: commit failed: ERROR: permission denied for relation i3sysadm_email_account (query: DELETE FROM i3sysadm_email_account WHERE userid = 'account(a)mydomain.com') Why the hack dovecot want to delete my e-mail account? Luckily it don't have the permission.. I tried to look in the source code for "delete from", but founded just a general sql handle method. One possiblity is dovecot try to delete a cascaded information, but what can it be? Please help, how can i fix this. Thanks in advance, Csaba root@c10:/var/log/dovecot# dovecot --version 2.2.9 root@c10:/var/log/dovecot# dovecot -n # 2.2.9: /etc/dovecot/dovecot.conf # OS: Linux 3.16.0-44-generic x86_64 Ubuntu 14.10 auth_cache_negative_ttl = 0 auth_failure_delay = 3 secs auth_master_user_separator = * auth_mechanisms = plain login auth_socket_path = /var/run/dovecot/auth-userdb base_dir = /var/run/dovecot/ dict { expire = sqlite:/etc/dovecot/dovecot-dict-sql.conf.ext quota = pgsql:/etc/dovecot/dovecot-dict-sql.conf.ext } disable_plaintext_auth = no first_valid_uid = 5000 hostname = mail.mydomain.com lda_mailbox_autocreate = yes listen = 87.229.104.6, :: lmtp_rcpt_check_quota = yes log_path = /var/log/dovecot/mail.log login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c login_trusted_networks = 192.168.0.0/24 mail_access_groups = dovenull mail_gid = dovenull mail_location = sdbox:~/sdbox mail_plugins = quota mail_uid = dovenull managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { acl = vfile:/etc/dovecot/global-acls:cache_secs=300 acl_shared_dict = file:/var/lib/dovecot/shared-mailboxes quota = dict:User quota::proxy::quota quota_grace = 10%% quota_rule = *:storage=100M recipient_delimiter = + sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } protocols = " imap lmtp sieve pop3" service auth-postlogin { executable = script-login /etc/dovecot/update_date_smtp.sh user = $default_internal_user } service auth-worker { unix_listener auth-worker { group = $default_internal_user mode = 0660 user = dovecot } user = $default_internal_user } service auth { executable = auth auth-postlogin unix_listener /var/spool/postfix/private/dovecot-auth { group = postfix mode = 0660 user = postfix } user = $default_internal_user } service dict { unix_listener dict { group = $default_internal_user mode = 0666 user = $default_internal_user } } service imap-login { inet_listener imap { port = 143 } inet_listener imaps { port = 993 ssl = yes } } service imap-postlogin { executable = script-login /etc/dovecot/update_date_imap.sh user = $default_internal_user } service imap { executable = imap imap-postlogin } service lmtp { executable = lmtp -L inet_listener lmtp { address = 127.0.0.1 port = 24 } unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service pop3-login { inet_listener pop3 { port = 110 } inet_listener pop3s { port = 995 ssl = yes } } service pop3-postlogin { executable = script-login /etc/dovecot/update_date_pop3.sh user = $default_internal_user } service pop3 { executable = pop3 pop3-postlogin } shutdown_clients = no ssl_cert = </etc/dovecot/dovecot.pem ssl_cipher_list = ALL:!LOW:!SSLv2:ALL:!aNULL:!ADH:!eNULL:!EXP:RC4+RSA:+HIGH:+MEDIUM ssl_key = </etc/dovecot/private/dovecot.pem ssl_protocols = !SSLv2 !SSLv3 submission_host = 127.0.0.1:25 userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } verbose_proctitle = yes protocol lmtp { info_log_path = /var/log/dovecot/lmtp.log mail_plugins = quota quota sieve postmaster_address = postmaster(a)mydomain.com } protocol lda { mail_plugins = quota sieve } protocol imap { imap_client_workarounds = delay-newmail mail_max_userip_connections = 10 mail_plugins = quota imap_quota } protocol pop3 { mail_max_userip_connections = 10 pop3_client_workarounds = outlook-no-nuls oe-ns-eoh } root@c10:/etc/dovecot# grep -v '^ *$#.*$\?$' dovecot-sql.conf.ext driver = pgsql connect = host=127.0.0.1 port=5432 dbname=mail user=maildata password=* default_pass_scheme = SSHA512 user_query = SELECT userdb_home AS home, userdb_uid AS uid, userdb_gid AS gid, \ mail_location AS mail, quota_rule \ FROM i3sysadm_email_account WHERE userid = '%Lu' AND active is true AND active_domain is true password_query = SELECT userid AS user, password, \ userdb_home, userdb_uid, userdb_gid, \ mail_location, quota_rule \ FROM i3sysadm_email_account WHERE userid = '%Lu' \ and active IS true AND active_domain IS true iterate_query = SELECT userid FROM i3sysadm_email_account \ WHERE active IS true AND active_domain IS true

2 1

How to skip errors on doveadm backup for migration ?
by Christoph Adomeit 24 Jan '16

24 Jan '16

Hi there, I have to migrate data out of a very old (debian 4) and buggy cyrus mailserver. About 40 Users with 200000 Messages each. Doveadm backup works quite well and gives me most of the mails. About every 100.000 Mail cannot be exported by cyrus. I do not want to bother about these errors. Maybe it is filesystem, maybe it is memory leak, or cyrus bug or whatever. My problem is that doveadm backup exits with an error if it cannot read a mail. Is there some way or option to make doveadm backup just skip the errors and continue with the next message ? I want to use doveadm sync because it preserves the uids of the mails. Imapsync works great but does not prserve uids. cyrus2dovecot is not an option because it does not work incremental and conversion would take far too long. Any ideas what I can do ? Thanks Christoph

3 5

Sieve "foreverypart" and "mime" extensions (RFC 5703) now implemented
by Stephan Bosch 24 Jan '16

24 Jan '16

Hi, I have finally managed to implement the Sieve "foreverypart" and "mime" extensions (RFC 5703). These are now included in the main Mercurial repository and will be included in the next release. I will be fixing a few minor details in the coming week; e.g., interaction with "include" and "editheader" extensions needs more work. Still, in the mean time, those of you who are interested can already test this feature a bit. It is not a small feature, so knowing bugs early is helpful. You can install it from the Mercurial repository or get the latest Debian packages from Xi. When I finish the last details (probably next week), I will release a first RC version of Pigeonhole v0.4.10 right away. Regards, Stephan.

2 2

Segfault in acl_mailbox_get_aclobj w/ dovecot
by D[r]eadlock M 23 Jan '16

23 Jan '16

Hello, I've being trying to play with shared mailboxes but experienced a segfault: [New LWP 9611] Core was generated by `dovecot/imap'. Program terminated with signal SIGSEGV, Segmentation fault. (gdb) bt f #0 0x00007f5b72f429b2 in acl_mailbox_get_aclobj (box=<optimized out>) at acl-mailbox.c:31 abox = 0x0 #1 0x00007f5b72d30fcc in cmd_myrights (cmd=0x7f5b75c97480) at imap-acl-plugin.c:331 ns = <optimized out> box = 0x7f5b75ca4520 mailbox = 0x7f5b75c752a8 "shared" orig_mailbox = 0x7f5b75c80be0 "shared" rights = 0x7f5b75c75108 str = <optimized out> #2 0x00007f5b73f2e09c in command_exec (cmd=cmd@entry=0x7f5b75c97480) at imap-commands.c:158 hook = 0x7f5b75c7e0f0 ret = <optimized out> #3 0x00007f5b73f2cfb2 in client_command_input (cmd=0x7f5b75c97480) at imap-client.c:778 client = 0x7f5b75c96880 command = <optimized out> __FUNCTION__ = "client_command_input" #4 0x00007f5b73f2d066 in client_command_input (cmd=0x7f5b75c97480) at imap-client.c:839 client = 0x7f5b75c96880 command = <optimized out> __FUNCTION__ = "client_command_input" #5 0x00007f5b73f2d39d in client_handle_next_command (remove_io_r=<synthetic pointer>, client=0x7f5b75c96880) at imap-client.c:877 No locals. #6 client_handle_input (client=0x7f5b75c96880) at imap-client.c:889 _data_stack_cur_id = 3 remove_io = false handled_commands = true client = 0x7f5b75c96880 #7 0x00007f5b73f2d745 in client_input (client=0x7f5b75c96880) at imap-client.c:931 cmd = 0x9f3f2 output = 0x7f5b75c972c0 bytes = 95 __FUNCTION__ = "client_input" #8 0x00007f5b73773d0f in io_loop_call_io (io=0x7f5b75c97390) at ioloop.c:441 ioloop = 0x7f5b75c7d740 t_id = 2 __FUNCTION__ = "io_loop_call_io" #9 0x00007f5b73774d09 in io_loop_handler_run_internal (ioloop=ioloop@entry=0x7f5b75c7d740) at ioloop-epoll.c:220 ctx = 0x7f5b75c7e3d0 io = <optimized out> tv = {tv_sec = 1799, tv_usec = 999014} events_count = <optimized out> msecs = <optimized out> ret = 1 i = 0 j = <optimized out> call = <optimized out> __FUNCTION__ = "io_loop_handler_run_internal" #10 0x00007f5b73773d79 in io_loop_handler_run (ioloop=ioloop@entry=0x7f5b75c7d740) at ioloop.c:488 No locals. #11 0x00007f5b73773df8 in io_loop_run (ioloop=0x7f5b75c7d740) at ioloop.c:465 __FUNCTION__ = "io_loop_run" #12 0x00007f5b7371edc3 in master_service_run (service=0x7f5b75c7d5d0, callback=<optimized out>) at master-service.c:566 No locals. #13 0x00007f5b73f21254 in main (argc=1, argv=0x7f5b75c7d390) at main.c:400 set_roots = {0x7f5b74145980 <imap_setting_parser_info>, 0x0} login_set = {auth_socket_path = 0x7f5b75c75048 "\001", postlogin_socket_path = 0x0, postlogin_timeout_secs = 60, callback = 0x7f5b73f371f0 <login_client_connected>, failure_callback = 0x7f5b73f36ed0 <login_client_failed>, request_auth_token = 1} service_flags = <optimized out> storage_service_flags = <optimized out> username = 0x0 c = <optimized out> It happens when my client (mutt) tries to enter the shared/ folder. A filtered strace shows (note the 7 seconds between write and read, presumely the command sent by mutt): 8704 00:40:51.420843 open("/var/vmail/domain.tld/marc/Maildir/.Sent/dovecot-acl", O_RDONLY) = -1 ENOENT (No such file or directory) 8704 00:40:51.420978 stat("/var/vmail/domain.tld/marc/Maildir/dovecot-acl", 0x7fffc618dcb0) = -1 ENOENT (No such file or directory) 8704 00:40:51.421100 open("/var/vmail/domain.tld/shared-mailboxes", O_RDONLY) = 4 8704 00:40:51.421800 openat(AT_FDCWD, "/var/vmail/domain.tld/marc/Maildir", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 12 8704 00:40:51.422217 write(7, "* LIST (\\HasNoChildren \\Sent) \"/\" Sent\r\n* LIST (\\Noselect \\HasNoChildren) \"/\" shared\r\n* LIST (\\HasNoChildren) \"/\" INBOX\r\na0005 OK List completed.\r\n", 147) = 147 8704 00:40:58.235762 <... read resumed> "a0006 MYRIGHTS \"shared\"\r\na0007 STATUS \"Drafts\" (MESSAGES)\r\na0008 SELECT \"shared\"\r\n", 8137) = 82 I admit I've played a little with directories in /var/vmail/ and got a few 'permission denied' but I think I fixed them correctly (move /var/mail/domain.tld/marc into .../Maildir, who ended being root:root) To finish, my dovecot -n: # 2.2.13: /etc/dovecot/dovecot.conf # OS: Linux 3.16.0-4-amd64 x86_64 Debian 8.2 mail_location = maildir:~/Maildir mail_plugins = acl namespace { location = maildir:%%h/Maildir:INDEXPVT=~/Maildir/shared/%%n prefix = shared/%%n/ separator = / type = shared } namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / type = private } passdb { args = scheme=SHA512-CRYPT username_format=%u /etc/dovecot/users driver = passwd-file } plugin { acl = vfile acl_shared_dict = file:/var/vmail/%d/shared-mailboxes } protocols = " imap lmtp" service auth-worker { user = $default_internal_user } service auth { unix_listener /var/spool/postfix/private/auth { mode = 0666 } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0666 user = postfix } } ssl = required ssl_cert = </etc/letsencrypt/live/domain.tld/fullchain.pem ssl_key = </etc/letsencrypt/live/domain.tld/privkey.pem userdb { args = uid=vmail gid=vmail home=/var/vmail/%d/%n driver = static } userdb { args = uid=vmail gid=vmail home=/var/vmail/%d/shared/%n driver = static } protocol imap { mail_plugins = acl imap_acl } Thanks, Marc

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