I've got a basic dovecot master-master replication setup between two servers (imap1 and imap2). Actions such as deleting messages or moving them between folders are replicated correctly and quickly.

However, when new mail is delivered by postfix, replication does not occur until something else triggers it, such as one of the delete/move actions mentioned earlier. A search suggested this may be due to the notify plugin, but I don't see any issue with the settings. Output of doveconf -n:

# 2.2.36 (1f10bfa63): /etc/dovecot/dovecot.conf # OS: Linux 4.19.118-0-vanilla x86_64 CentOS Linux release 7.8.2003 (Core) # Hostname: imap1 disable_plaintext_auth = no doveadm_password = # hidden, use -P to show it first_valid_uid = 1000 haproxy_trusted_networks = 172.16.0.0/24 mail_location = maildir:~/Mail mail_plugins = zlib notify replication mailbox_list_index = yes mailbox_list_index_include_inbox = yes maildir_empty_new = yes mbox_write_locks = fcntl namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { mail_replica = tcp:imap2:9943 replication_sync_timeout = 2 } protocols = imap service aggregator { fifo_listener replication-notify-fifo { mode = 0666 user = dovecot } unix_listener replication-notify { mode = 0666 user = dovecot } } service config { unix_listener config { user = dovecot } } service doveadm { inet_listener { port = 9943 } } service imap-login { inet_listener imap_hpx { haproxy = yes port = 943 } } service replicator { process_min_avail = 1 unix_listener replicator-doveadm { mode = 0666 } } ssl = no userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol lda { mail_plugins = zlib notify replication } protocol imap { mail_plugins = zlib notify replication imap_zlib }

I specifically tried setting the following as no and yes as they can affect notifications:

mailbox_list_index = yes mailbox_list_index_include_inbox = yes maildir_empty_new = yes

The other server has the same settings except obviously mail_replica = tcp:imap1:9943.

Any suggestions welcome, thanks!