Address Class

Purpose

Domain names

Valid recipients

Transport

local domain

Final delivery for traditional UNIX system accounts and traditional Sendmail-style aliases. This is typically used for the canonical domains of the machine

All the canonical domains. Listed in mydestination= including ip addresses used like username@[ip.add.re.ss] for ips listed in inet_interfaces= and proxy_interfaces=

Listed in local_recipient_maps= (see LOCAL_RECIPIENT_README

local_transport=
default: local:$myhostname

virtual alias

Delivery for hosted domains where each recipient address is aliased to a local UNIX system account or to a remote address

Hosted domains listed in virtual_alias_domains=

Listed with the virtual_alias_maps=

There is no mail delivery transport parameter. Every address must be aliased to some other address

virtual mailbox

Delivery for hosted domains where each recipient address can have its own mailbox, and where users do not need to have a UNIX system account

Hosted domains listed in virtual_mailbox_domains=

Listed in virtual_mailbox_maps=

virtual_transport=
default: virtual

relay

Forwarding to remote destinations that list your system as primary or backup MX host

Forwarding domains listed in relay_domains=

Listed in relay_recipient_maps=

relay_transport=
default: relay (clone of smtp)

default

Forwarding to the Internet on behalf of authorized clients

No valid domains table

No valid recipients table

default_transport=
default: smtp