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=<r...@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=<r...@domain.com>, method=PLAIN, rip=69.xx.xx.xx, lip=-----, pip=------, mpid=7709, secured, session=<7iLADiHx7wBFdoaw> Jan 29 14:36:30 imap1 dovecot: pop3(r...@domain.com): Disconnected: Logged out top=0/0, retr=0/0, del=1/1227, size=51548362 Jan 29 14:36:33 imap1 dovecot: pop3(r...@domain.com): Error: Message ordering changed unexpectedly (msg #1: storage seq 1 -> 2) Jan 29 14:36:33 imap1 dovecot: pop3(r...@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=<r...@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=<r...@domain.com>, method=PLAIN, rip=69.xx.xx.xx, lip=-------, pip=-------, mpid=31119, secured, session=<GvQMD4TxrwBFdoaw> Feb 3 12:43:17 imap1 dovecot: pop3(r...@domain.com): Disconnected: Logged out top=0/0, retr=1/80835, del=2/1192, size=48287015 Feb 3 12:43:18 imap1 dovecot: pop3(r...@domain.com): Error: Message ordering changed unexpectedly (msg #1: storage seq 1 -> 3) Feb 3 12:43:18 imap1 dovecot: pop3(r...@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 = postmas...@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
}

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