[Dovecot] POP3: Message ordering changed unexpectedly

Mon Feb 3 22:19:17 UTC 2014

Hi,

I think I'm having a problem with simultaneous pop3 connections on the 
same mailbox with one connection deleting a message.

Jan 29 14:36:30 imap1 dovecot: pop3-login: Login: 
user=<riki at domain.com>, method=PLAIN, rip=82.xx.xx.xx, lip=-----, 
pip=------, mpid=7703, secured, session=<1A+8DiHxfABSUCCH>
Jan 29 14:36:30 imap1 dovecot: pop3-login: Login: 
user=<riki at domain.com>, method=PLAIN, rip=69.xx.xx.xx, lip=-----, 
pip=------, mpid=7709, secured, session=<7iLADiHx7wBFdoaw>
Jan 29 14:36:30 imap1 dovecot: pop3(riki at domain.com): Disconnected: 
Logged out top=0/0, retr=0/0, del=1/1227, size=51548362
Jan 29 14:36:33 imap1 dovecot: pop3(riki at domain.com): Error: Message 
ordering changed unexpectedly (msg #1: storage seq 1 -> 2)
Jan 29 14:36:33 imap1 dovecot: pop3(riki at domain.com): Disconnected: POP3 
UIDLs couldn't be listed top=3/2662, retr=0/0, del=0/1227, size=51548362

and again:

Feb  3 12:43:16 imap1 dovecot: pop3-login: Login: 
user=<riki at domain.com>, method=PLAIN, rip=82.xx.xx.xx, lip=-------, 
pip=-------, mpid=31095, secured, session=<ae74DoTxtABSUCCU>
Feb  3 12:43:17 imap1 dovecot: pop3-login: Login: 
user=<riki at domain.com>, method=PLAIN, rip=69.xx.xx.xx, lip=-------, 
pip=-------, mpid=31119, secured, session=<GvQMD4TxrwBFdoaw>
Feb  3 12:43:17 imap1 dovecot: pop3(riki at domain.com): Disconnected: 
Logged out top=0/0, retr=1/80835, del=2/1192, size=48287015
Feb  3 12:43:18 imap1 dovecot: pop3(riki at domain.com): Error: Message 
ordering changed unexpectedly (msg #1: storage seq 1 -> 3)
Feb  3 12:43:18 imap1 dovecot: pop3(riki at domain.com): Disconnected: POP3 
UIDLs couldn't be listed top=3/2898, retr=0/0, del=0/1192, size=48287015

Running Dovecot 2.2.10+hg-6018854c8c91
Mailboxes were migrated recently using dsync with pop3 migration plugin.

Is there a better way to handle this without logging an error? Am I 
doing something wrong?

Any help is appreciated.

Thanks,

Gedalya

# dovecot -n
# 2.2.10: /etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.3
auth_mechanisms = plain login cram-md5
auth_verbose = yes
auth_verbose_passwords = plain
dict {
   expire = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
   quota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
imapc_features = rfc822.size fetch-headers
login_greeting = Dovecot ready
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l 
pip=%{real_rip} mpid=%e %c session=<%{session}>
login_trusted_networks = xx.xx.xx.2
mail_gid = vmail
mail_location = /nowhere
mail_plugins = quota expire listescape
mail_uid = vmail
managesieve_sieve_capability = fileinto envelope encoded-character 
subaddress comparator-i;ascii-numeric relational regex imap4flags copy 
include variables mailbox date ihave
namespace {
   hidden = yes
   list = no
   location = pop3c:
   prefix = POP3-MIGRATION-NS/
}
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 =
   separator = /
   type = private
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   antispam_backend = pipe
   antispam_pipe_program = /usr/bin/ssh
   antispam_pipe_program_args = 
-l;spamd;-i;/etc/dovecot/sareport.key;mx.domain.com
   antispam_pipe_program_notspam_arg = revoke
   antispam_pipe_program_spam_arg = report
   antispam_pipe_tmpdir = /tmp
   antispam_spam = Junk
   antispam_trash_pattern_ignorecase = trash;Deleted *
   expire = Trash
   expire2 = Trash/*
   expire3 = Junk
   expire_dict = proxy::expire
   pop3_migration_mailbox = POP3-MIGRATION-NS/INBOX
   quota = dict:user::proxy::quota
   quota_rule = *:storage=2G
   quota_rule2 = Trash:storage=+250M
   quota_rule3 = Junk:ignore
   quota_warning = storage=99%% quota-warning 99 %u
   quota_warning2 = storage=95%% quota-warning 95 %u
   sieve = ~/.dovecot.sieve
   sieve_before = /etc/dovecot/sieve-global/fileinto-spam.sieve
   sieve_dir = ~/sieve
   sieve_extensions = -vacation -body -reject -enotify -environment 
-virustest -spamtest
   sieve_max_actions = 32
   sieve_max_redirects = 4
   sieve_max_script_size = 10K
   sieve_quota_max_scripts = 100
   sieve_quota_max_storage = 4M
}
pop3_no_flag_updates = yes
postmaster_address = postmaster at domain.com
protocols = imap pop3 lmtp sieve
service auth-worker {
   user = $default_internal_user
}
service auth {
   client_limit = 2448
   unix_listener auth-userdb {
     group = root
     mode = 0600
     user = vmail
   }
}
service dict {
   unix_listener dict {
     group = root
     mode = 0600
     user = vmail
   }
}
service imap-login {
   process_min_avail = 4
   service_count = 0
   vsz_limit = 192 M
}
service imap-postlogin {
   executable = script-login /usr/local/bin/postlogin
   unix_listener imap-postlogin {
     group = root
     mode = 0600
     user = vmail
   }
   user = root
}
service imap {
   executable = imap imap-postlogin
   process_limit = 1024
   vsz_limit = 128 M
}
service lmtp {
   inet_listener lmtp {
     address = 10.44.23.1
     port = 7025
   }
}
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
   service_count = 0
   vsz_limit = 64 M
}
service managesieve {
   process_limit = 20
}
service pop3-login {
   process_min_avail = 4
   service_count = 0
   vsz_limit = 192 M
}
service pop3 {
   executable = pop3 imap-postlogin
   process_limit = 1024
}
service quota-warning {
   executable = script /usr/local/bin/quota-warning
   unix_listener quota-warning {
     user = vmail
   }
   user = dovecot
}
ssl_cert = </etc/dovecot/dovecot.pem
ssl_key = </etc/dovecot/private/dovecot.pem
userdb {
   driver = prefetch
}
userdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
verbose_proctitle = yes
protocol lmtp {
   mail_plugins = quota expire listescape sieve
   plugin {
     quota = dict:user::noenforcing:proxy::quota
   }
}
protocol lda {
   mail_plugins = quota expire listescape sieve
}
protocol imap {
   mail_max_userip_connections = 12
   mail_plugins = quota expire listescape imap_quota antispam
   ssl_cert = </etc/dovecot/imap.domain.com.crt
   ssl_key = </etc/dovecot/private/imap.domain.com.key
}
protocol sieve {
   mail_max_userip_connections = 5
}
protocol pop3 {
   mail_max_userip_connections = 10
   ssl_cert = </etc/dovecot/pop.domain.com.crt
   ssl_key = </etc/dovecot/private/pop.domain.com.key
}
protocol doveadm {
   mail_plugins = quota expire listescape pop3_migration
}