Postfix and Dovecot LMTP
Starting with Dovecot 2.x a LMTP-Server has been added.
Basic Configuration
The first step is to enable its stack via /etc/dovecot/dovecot.conf
!include conf.d/*.conf protocols = imap lmtp
Socket configuration
The actual socket is configured in /etc/dovecot/conf.d/10-master.conf. The LMTP service can be bound to both INET or Unix sockets. In this example a Unix socket is placed inside the Postfix spool with appropriate permissions set:
service lmtp {
unix_listener /var/spool/postfix/private/dovecot-lmtp {
group = postfix
mode = 0660
user = postfix
}
}
Plugin Support
Plugin support can be enabled at protocol level via /etc/dovecot/conf.d/20-lmtp.conf, for Quota and Sieve here:
protocol lmtp {
mail_plugins = quota sieve
}
Postfix main.cf Configuration
The final step is to tell Postfix to use this socket for final delivery, in this case in a virtual user scenario:
virtual_transport = lmtp:unix:private/dovecot-lmtp
For a non virtual user setup ( as when mail_location = maildir:~/.maildir ) :
mailbox_transport = lmtp:unix:private/dovecot-lmtp