iredmail-doc/en_US/upgrade/0-upgrade.dovecot.2.2-2.3.md

Upgrade Dovecot from 2.2.x to 2.3.x

Dovecot 2.3 breaks some backward compatible, and here's a short tutorial to convert your Dovecot 2.2 config file to fully work with Dovecot 2.3.

For more details, please read Dovecot wiki page: Upgrading Dovecot v2.2 to v2.3.

!!! attention

* Currently only FreeBSD offers Dovecot 2.3 by the ports tree, other Linux
  or OpenBSD distributions still offers Dovecot 2.2, you should stick to
  Dovecot 2.2 if your Linux/BSD vendor doesn't offer 2.3 yet.
* Dovecot 2.3 uses TLSv1 as minimal SSL protocol, if you prefer TLSv1.1 or
  TLSv1.2, please set the protocol version in parameter `ssl_min_protocol`
  like below:

  ```
  ssl_min_protocol = TLSv1.2
  ```

Upgrade Dovecot on Linux/FreeBSD/OpenBSD

Open a shell terminal, and switch to Dovecot configuration directory first:

• On Linux/OpenBSD:

cd /etc/dovecot/

• On FreeBSD:

cd /usr/local/etc/dovecot/

Run commands below as root user, these commands will:

• Comment out parameter ssl_protocols
• Remove parameter postmaster_address
• Rename plugin names and parameters:
  • stats -> old_stats
  • imap_status -> imap_old_stats
  • stats_refresh -> old_stats_refresh
  • service stats {} -> service old-stats {}
  • fifo_listener stats-mail {} -> fifo_listener old-stats-mail {}
  • stats_track_cmds -> old_stats_track_cmds

perl -pi -e 's/^ssl_protocols/#${1}/g' dovecot.conf
perl -pi -e 's#(postmaster_address.*)##g' dovecot.conf
perl -pi -e 's#^(mail_plugins.*) stats(.*)#${1} old_stats${2}#g' dovecot.conf
perl -pi -e 's#imap_stats#imap_old_stats#g' dovecot.conf
perl -pi -e 's#service stats#service old-stats#g' dovecot.conf
perl -pi -e 's#fifo_listener stats-mail#fifo_listener old-stats-mail#g' dovecot.conf
perl -pi -e 's#stats_refresh#old_stats_refresh#g' dovecot.conf
perl -pi -e 's#stats_track_cmds#old_stats_track_cmds#g' dovecot.conf

• On RHEL/CentOS, please add new setting in dovecot.conf:

ssl_dh = </etc/pki/tls/dh2048_param.pem

• On Debian/Ubuntu/OpenBSD/FreeBSD, please add new setting in dovecot.conf:

ssl_dh = </etc/ssl/dh2048_param.pem