Duplicate mails with pop3 + dsync replication

[Wolfgang Hennerbichler]

Hi,

When I enable (and it only happens when it is actually running) replication over TCP my users get duplicate mails via pop3. 
Here’s what happens: 

* User gets mail
* Mail appears in (Maildir) new/ folder on both replicas
* user retrieves mail (retr), calls dele. Mail still exists in new/ folder on both replicas. 
* user runs retr (and gets the duplicate) and dele a second time, the mail is actually removed. 
If I disable replication this behaviour goes away. 
I use dovecot from debian stable resources. 
Any help would _really_ be appreciated. I found one german thread that dealt with the same problem, but no solution for it (http://www.dovecot-buch.de/mailingliste/pop3-fehler-bei-delete-und-dsync-replikation/) 

wogri

# dovecot --version
2.2.13

# dovecot -n 
# 2.2.13: /etc/dovecot/dovecot.conf
# OS: Linux 3.16.0-4-amd64 x86_64 Debian 8.0 ext4
auth_verbose = yes
doveadm_password = XXX
first_valid_gid = 113
first_valid_uid = 108
last_valid_gid = 113
last_valid_uid = 108
mail_gid = dovecot
mail_location = maildir:/var/mail/%n
mail_plugins = quota fts fts_lucene virtual notify replication
mail_temp_dir = /var/lib/dovecot/tmp
mail_uid = dovecot
namespace {
  list = children
  location = virtual:/var/mail/%n/virtual
  prefix = virtual.
  separator = .
}
namespace inbox {
  inbox = yes
  list = yes
  location = 
  mailbox "Deleted Messages" {
    auto = subscribe
    special_use = \Trash
  }
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    auto = no
    special_use = \Sent
  }
  mailbox Spam {
    auto = subscribe
    special_use = \Junk
  }                                                                                                                                                                       [48/4646]
  mailbox Trash {
    special_use = \Trash
  }
  prefix = 
  separator = .
  subscriptions = yes
  type = private
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}
plugin {
  default_language = de
  fts = lucene
  fts_lucene = whitespace_chars=@.
  mail_replica = tcp:172.16.1.1:12345
  quota = maildir:User quota
  quota_rule = *:storage=4G
  quota_rule2 = Trash:storage=+100M
  quota_rule3 = Spam:ignore
  quota_warning = storage=95%% quota-warning 95 %u
  quota_warning2 = storage=80%% quota-warning 80 %u
  sieve = /etc/sieve/%n.sieve
  sieve_default = /etc/sieve/default.sieve
  sieve_dir = ~/sieve
  sieve_extensions = +editheader
}
postmaster_address = postmaster at wogri.at
protocols = " imap lmtp pop3"
service aggregator {
  fifo_listener replication-notify-fifo {
    user = dovecot
  }
  unix_listener replication-notify {
    user = dovecot
  }
}
service doveadm {
  inet_listener {
    port = 12345
  }
}
service imap {
  process_limit = 1024
}
}
service lmtp {
  inet_listener lmtp {
    address = 127.0.0.1
    port = 2003
  }
  user = dovecot
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
  service_count = 1
}
service pop3 {
  process_limit = 1024
}
service quota-warning {
  executable = script /usr/local/sbin/quota-warning.sh
  unix_listener quota-warning {
    user = dovecot
  }
  user = dovecot
}
service replicator {
  process_min_avail = 1
  unix_listener replicator-doveadm {
    mode = 0600
  }
}
ssl = required
ssl_cert = </etc/exim4/server.cert.pem
ssl_key = </etc/exim4/server.key.pem
userdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}
protocol lmtp {
  mail_plugins = quota sieve virtual notify replication
}
protocol lda {
  mail_plugins = quota fts fts_lucene virtual notify replication sieve
}
protocol imap {
  mail_max_userip_connections = 50
  mail_plugins = quota fts fts_lucene virtual notify replication imap_quota
}

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