Dovecot Virtual Mailbox, Replication with Postfix
Configure dovecot virtual mailbox, replication with postfix.
Highlight
Active/Active Pair:
- Use Dovecot replication, no share storage(eg. NFS) required.
- User db need to be sync manually on both side
Linux Preparation
Create User Vmail
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| groupadd -g 5000 vmail
useradd -m -u 5000 -g 5000 -d /var/vmail vmail
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Dovecot
Services
/etc/dovecot/conf.d/10-master.conf
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| service imap-login {
inet_listener imap {
port = 143
}
inet_listener imaps {
port = 993
ssl = yes
}
process_min_avail = 4
}
service lmtp {
inet_listener {
address = 127.0.0.1
port = <dovecot_lmtp_port>
}
user = vmail
executable = lmtp -L
}
service auth {
inet_listener {
address = 127.0.0.1
port = <dovecot_auth_port>
}
}
service auth-worker {
user = $default_internal_user
}
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<dovecot_lmtp_port> and <dovecot_auth_port> have to match values used in main.cf in Postfix Dovecot Integration below.
IMAP Folders
/etc/dovecot/conf.d/10-mail.conf
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| mail_plugins = $mail_plugins notify replication
mail_location = maildir:~/maildir
namespace inbox {
inbox = yes
type = private
separator = /
hidden = no
mailbox Trash {
auto = no
special_use = \Trash
}
mailbox Drafts {
auto = no
special_use = \Drafts
}
mailbox Sent {
auto = subscribe # autocreate and autosubscribe the Sent mailbox
special_use = \Sent
}
mailbox "Sent Messages" {
auto = no
special_use = \Sent
}
mailbox Spam {
auto = create # autocreate Spam, but don't autosubscribe
special_use = \Junk
}
}
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Replication
Enable replication plugin.
/etc/dovecot/conf.d/90-plugin.conf
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| plugin {
mail_replica = tcp:<remote hostname/ip>:<doveadm_port>
}
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/etc/dovecot/conf.d/local.conf
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| # Doveadm (used by sync service)
service doveadm {
inet_listener {
# Any port
port = <doveadm_port>
password = <doveadm_password>
}
}
# Fix permissions for vmail user
service aggregator {
fifo_listener replication-notify-fifo {
user = vmail
group = vmail
mode = 0660
}
unix_listener replication-notify {
user = vmail
group = vmail
mode = 0660
}
}
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User Database
We will use the simple passwd-file type user database.
/etc/dovecot/conf.d/10-auth.conf
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| auth_mechanisms = plain
disable_plaintext_auth = no
passdb {
driver = passwd-file
args = username_format=%u /etc/dovecot/user.db
}
userdb {
driver = passwd-file
default_fields = uid=vmail gid=vmail home=/var/vmail/%u
args = username_format=%u /etc/dovecot/user.db
}
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Create /etc/dovecot/user.db:
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| <email-address>:<crypt-password>
user1@example.com:password1
user2@example.com:password2
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Create crypt-password:
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| doveadm pw -u <email> -p <password>
doveadm pw -u test@test.com -p test
{CRYPT}$2y$05$6caJDCFEge0qA1vBxjDWVOftUzwjrDx794c88gtVB0we6RlchrWxu
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Above example will be as follow in user.db
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| test@test.com:{CRYPT}$2y$05$6caJDCFEge0qA1vBxjDWVOftUzwjrDx794c88gtVB0we6RlchrWxu
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Other dovecote user database types can be found here.
Logging
/etc/dovecot/conf.d/10-logging.conf
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| log_path = /var/log/dovecot.log
info_log_path = /var/log/dovecot-info.log
mail_debug = no
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Postfix
Dovecot Integration
/etc/postfix/main.cf add following:
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| # relayhost = [<hostname/ip>]:25
#Dovecot
smtpd_sasl_type = dovecot
smtpd_sasl_path = inet:localhost:<dovecot_auth_port>
smtpd_sasl_auth_enable = yes
virtual_mailbox_domains = <domain>
#virtual_alias_maps = hash:/etc/postfix/virtual
virtual_transport = lmtp:inet:127.0.0.1:<dovecot_lmtp_port>
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/etc/postfix/master.cf modify submission:
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| # Enable submission
submission inet n - n - - smtpd
-o smtpd_sasl_type=dovecot
-o smtpd_sasl_auth_enable=yes
-o milter_macro_daemon_name=ORIGINATING
-o smtpd_client_restrictions=permit_sasl_authenticated,reject
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John Siu
Update: 2020-08-12
