On Sun, Jan 30, 2011 at 05:36:00PM -0500, Wietse Venema wrote:
> The following is the simplest example that uses virtual_alias_maps
> to deflect unknown users to the MS Exchange mailserver, and that
> uses reject_unverified_recipient to find out if those users exist.
> Postfix 2.7 and later automatically cache the reject_unverified_recipient
> result.
>
> /etc/postfix/main.cf:
> virtual_alias_domains = a.example
> virtual_alias_maps = hash:/etc/postfix/virtual_alias
> smtpd_recipient_restrictions =
> reject_unauth_destination reject_unverified_recipient
>
> /etc/postfix/virtual_alias:
> user1@a.example user1@localhost
> user2@a.example user2@localhost
> @a.example @ms-exchange-mailserver
The domain could be added to relay_domains, with relay_recipient_maps
set empty. An access table could have:
rcpt-access:
# Some known, verify the rest:
example.com reject_unverified_recipient
example.net reject_unverified_recipient
# All known, so default reject:
example.org REJECT 5.1.1 Recipient address unknown
# The list of known users
#
known-us...@example.com DUNNO
known-us...@example.net DUNNO
known-us...@example.org DUNNO
...
main.cf:
# Use access(5) instead of relay_recipient_maps:
relay_recipient_maps =
relay_domains = example.com
smtpd_recipient_restrictions =
reject_unauth_destination,
check_recipient_access hash:/etc/postfix/rcpt-access
--
Viktor.
