Incompatibilities with Postfix 1.1

Postfix 2.0 address classes introduce a few incompatible changes in documented behavior. In order to ease the transitions, new parameters have default values that are backwards compatible.

• The virtual_maps parameter is replaced by virtual_alias_maps (for address lookups) and by virtual_alias_domains (for the names of what were formerly called "Postfix-style virtual domains").

  For backwards compatibility with Postfix version 1.1, the new virtual_alias_maps parameter defaults to $ virtual_maps, and the new virtual_alias_domains parameter defaults to $ virtual_alias_maps.

• The virtual_mailbox_maps parameter now has a companion parameter called virtual_mailbox_domains (for the names of domains served by the virtual delivery agent). The virtual_mailbox_maps parameter is now used for address lookups only.

  For backwards compatibility with Postfix version 1.1, the new virtual_mailbox_domains parameter defaults to $ virtual_mailbox_maps.

• Introduction of the relay_recipient_maps parameter. The Postfix SMTP server can use this to block mail for relay recipients that don't exist. This list is empty by default, which means accept any recipient.

• The local_recipient_maps feature is now turned on by default. The Postfix SMTP server uses this to reject mail for unknown local recipients. See the LOCAL_RECIPIENT_README file hints and tips.

• Introduction of the relay delivery transport in master.cf. This helps to avoid mail delivery scheduling problems on inbound mail relays when there is a lot of outbound mail, but may require that you update your " defer_transports" setting.