Verification of Postfix configuration requested

Hello all,

We've just moved our clients to a new mail server. Both the old and new
config contain postfix, amavisd-new, mysql and cyrus-imapd.

All virtual, transport, etc information is in a flat mysql database.
This database is created out of another relational database.

We've used these applications for some years now, but due to the changes
in suggested configuration layouts, we'd like to 'verify' our
configuration in this group. Any comments on configuration faults,
performance issues, tweaks, etc. are welcome.

So here goes:

We host several client domains. Not all want spam and virus filtering so
we've stored preferences in our database. Based on *_access check with a
"FILTER amavis:[127.0.0.1]:amavis" RHS we filter only those domains that
we want to filter:

smtpd_recipient_restrictions =
...
check_sender_access
proxy:mysql:$config_directory/maps/mysql-filter.cf
check_recipient_access
proxy:mysql:$config_directory/maps/mysql-filter.cf
...

The smtpd clients and amavis smtp client are configured like this:

smtp inet n - n - - smtpd
-o receive_override_options=no_address_mappings
-o content_filter=smtp:[127.0.0.1]:postscan

localhost:postscan inet n - n - - smtpd
-o smtpd_recipient_restrictions=permit_mynetworks,rej ect
-o smtpd_authorized_xforward_hosts=127.0.0.0/8
-o
receive_override_options=no_unknown_recipient_chec ks,no_header_body_checks

amavis unix - - n - 5 smtp
-o smtp_bind_address=127.0.0.1
-o smtp_send_xforward_command=yes

The "-o content_filter=smtp:[127.0.0.1]:postscan" is for those domains
that do not match the mysql-filter.cf and would otherwise not be found
in the virtual alias maps because of the
receive_override_options=no_address_mappings statement, right?

Local delivery is through:
mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp

I want to change this to "local_transport =
lmtp:unix:/var/lib/imap/socket/lmtp" so multi-recipient deliveries are
better off, but will have to migrate my aliases.db to virtual aliases
first, right?

We places "myorigin = mailbox.ourdomain.com" in main.cf because all
Cyrus mailboxes are in the "mailbox.ourdomain.com" realm. We would like
to have Postfix send out local e-mail with a @truehostname.ourdomain.com
suffix, instead of mailbox.ourdomain.com, but I don't see that happening
yet. Unless I append @mailbox.ourdomain.com to every virtual aliases, right?

The latest Cyrus supports different realms (or virtual domains). One for
each client. I can now create a user john@domain1.com and a user
john@domain2.com. What would my vitual aliases look like? If I put
things like:

john@example1.com john@example1.com

I would generate a loop. Or do I put

john@example1.com lmtp:john@example1.com

Thanks all for your input!

Regards,

Spookyfish