Duplicate mails with pop3 + dsync replication

20 Jun 2015 · _really_

      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-rep...)

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@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
}

Duplicate mails with pop3 + dsync replication

Wolfgang Hennerbichler