what you are trying to do is enable replication
2.3 is supported it is my understanding this was removed in 2.4 (unless
you buy a contract)
basic replication is as follows :
on each server ifconfig
mail_plugins = " virtual notify replication fts fts_lucene listescape "
replication_dsync_parameters = -d -N -l 300 -U
plugin {
mail_log_events = delete undelete expunge copy mailbox_delete
mailbox_rename
mail_log_fields = uid, box, msgid, from, subject, size, vsize, flags
push_notification_driver = dlog
sieve = file:~/sieve;active=~/sieve/.dovecot.sieve
#sieve = ~/.dovecot.sieve
sieve_duplicate_default_period = 1h
sieve_duplicate_max_period = 1h
sieve_extensions = +duplicate +notify +imapflags +vacation-seconds
sieve_global_dir = /usr/local/etc/dovecot/sieve
sieve_before = /usr/local/etc/dovecot/sieve/duplicates.sieve
sieve_max_redirects = 64
#sieve_vacation_send_from_recipient = yes
mail_replica = tcp:10.221.0.19:12345
< dedicated replication ip address and port each server points to the
other server >
ie my other server is :
mail_replica = tcp:10.221.0.18:12345
when a received email or imap fuction occurs it send an explation of
what to do to the other server.
i need to run a mysql or pgsql database for this to work
dovecot-pgsql.conf
driver = pgsql
connect = host=localhost port=5433 dbname=scom_billing user=pgsql
password=xxxxx
default_pass_scheme = PLAIN
password_query = SELECT username as user, password FROM email_users
WHERE username = '%u' and password <> 'alias' and status = True and
destination = '%u'
user_query = SELECT home, uid, gid FROM email_users WHERE username =
'%u' and password <> 'alias' and status = True and destination = '%u'
#iterate_query = SELECT user, password FROM email_users WHERE username =
'%u' and password <> 'alias' and status = True and destination = '%u'
iterate_query = SELECT "username" as user, domain FROM email_users WHERE
status = True and alias_flag = False
}
...
iterate_query returns what is to be replicated / synced
...
protocol imap {
imap_literal_minus = yes
imap_idle_notify_interval = 30 seconds
imapc_max_idle_time = 1440 mins
mail_max_userip_connections = 50
mail_plugins = $mail_plugins notify replication
}
protocol pop3 {
mail_max_userip_connections = 50
mail_plugins = $mail_plugins notify replication
}
protocol imaps {
mail_max_userip_connections = 50
mail_plugins = $mail_plugins notify replication
}
protocol pop3s {
mail_max_userip_connections = 50
mail_plugins = $mail_plugins notify replication
}
replication_max_conns = 100
replication_full_sync_interval = 3d
service replicator {
client_limit = 0
drop_priv_before_exec = no
idle_kill = 4294967295s
process_limit = 1
process_min_avail = 0
service_count = 0
vsz_limit = 8g
unix_listener replicator-doveadm {
mode = 0600
user = vmail
}
vsz_limit = 8192M
}
service aggregator {
process_limit = 1000
#vsz_limit = 1g
fifo_listener replication-notify-fifo {
user = vmail
group = vmail
mode = 0666
}
Hopes this helps.
Thanks - Paul Kudla (Manager SCOM.CA Internet Services Inc.)
Have A Happy Wednesday AND Happy Sucessful 2026 !
Scom.ca Internet Services <http://www.scom.ca>
104-1009 Byron Street South
Whitby, Ontario - Canada
L1N 4S3
Toronto 416.642.7266
Main 1.866.411.7266
Fax 1.888.892.7266
Email [email protected]
On 2026-03-04 12:30 p.m., Marc Singer via dovecot wrote:
Greetings,
I was pleased to see that dovecot has a sync function in doveadm. So far,
other tools for moving mailbox contents from one server to another has not
been successful.
However.
Perhaps I don't understand how this should work. I have a new
containerized dovecot v2.4.2
# 2.4.2 (0962ed2104): /etc/dovecot/dovecot.conf
# OS: Linux 6.12.63+deb13-amd64 x86_64
and I have an existing dovecot running in a VPS:
# 2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.19 (4eae2f79)
# OS: Linux 6.1.0-35-amd64 x86_64 Debian 12.11
I want to move one user, as a test. I execute this in the container.
# doveadm sync -R1 -u USER tcps:OLD_SERVER:993
doveadm(USER): Error: conn OLD_SERVER:993 (IP:993): doveadm server sent
invalid handshake: * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID
ENABLE IDLE LITERAL+ AUTH=PLAIN AUTH=LOGIN] Dovecot (Debian) ready.
doveadm(USER): Error: cmd sync: Disconnected from remote: Connection
closed
I'm pretty sure that doveadm sync was able to negotiate the TLS
connection. I don't see what it could object to in the sign-on. What am
I missing?
Cheers
--
Marc Oscar Singer
Woollysoft
Dial 817.1823.602.1+ from right to left.
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