On Wed, Jun 04, 2014 at 11:52:59AM +1000, Andrew Stuart wrote:

> alias_database = hash:/etc/aliases
> alias_maps = hash:/etc/aliases
> home_mailbox = Maildir/

Only applicable with local(8) delivery, but you have
local_transport = virtual, so unless you have explicit
transport entries selecting "local", these can be set
empty.

> local_recipient_maps = $virtual_mailbox_maps
> local_transport = virtual
> mydestination = example.org, localhost.example.org, localhost

So example.org users should be routed to virtual(8) barring
transport overrides.

> relay_domains = in.example.org
> relayhost = mail.power.com

This domain should be routed to the "relay" transport barring
transport overrides, with a nexthop of $relayhost.

> smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated
>       defer_unauth_destination

Change defer to reject when you get a chance.

> smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
> smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key

    http://www.postfix.org/TLS_README.html#quick-start

> smtpd_use_tls = yes

    smtpd_tls_security_level = may

> transport_maps = hash:/etc/postfix/transport

    What's in there relating to either domain or a "*"
    entry?

> virtual_alias_maps = hash:/etc/postfix/virtual.aliases

    Are addresses in example.org rewritten to some other domain?
    Log entries of mail leaving via relayhost?

-- 
        Viktor.

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