Dovecot 2.3 changes - Notice for upgrades from Version 2.2 to Version 2.3

These are the new configuration commands:
ssl_protocols setting replaced by ssl_min_protocol. Specify the minimum ssl protocol version that Dovecot accepts. Default: TLSv1.
Example command: ssl_min_protocol = TLSv1.2


ssl_parameters replaced with ssl_dh. SSLv2 is not supported in ssl_protocols.

recipient_delimiter is now an alternative delimiter characters

director_doveadm_port setting removed. Name the inet_listener doveadm { .. } instead.

mdbox_purge_preserve_alt removed.

director_consistent_hashing removed