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Postfix 2.0 address classes made the following improvements
possible over earlier Postfix versions:
-
You no longer need to specify all the
virtual(8) mailbox
domains in the Postfix transport map. The
virtual(8) delivery agent
has become a first-class citizen just like
local(8) or
smtp(8).
-
On mail gateway systems, address classes provide separation
of inbound mail relay traffic ($
relay_transport) from outbound
traffic ($
default_transport). This eliminates a problem where
inbound mail deliveries could become resource starved in the presence
of a high volume of outbound mail.
-
The SMTP server rejects unknown recipients in a more
consistent manner than was possible with Postfix version 1. This
is needed to keep undeliverable mail (and bounced undeliverable
mail) out of the mail queue. This is controlled by the
smtpd_reject_unlisted_recipient configuration parameter.
-
As of Postfix version 2.1, the SMTP server also rejects
unknown sender addresses (i.e. addresses that it would reject as
unknown recipient addresses). Sender "egress filtering" can help
to slow down an email worm explosion. This is controlled by the
smtpd_reject_unlisted_sender configuration parameter.
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