Spam/Virus checking is occurring for secondary mail. Avoidable?

Hello,
Like many, I added "localdomainsmaps = ( 1 );" to my amavisd.conf file to ensure email to my virtual hosts and local aliases was scanned. However, I've noticed in my quarantine directory/folder, that the domains I act as a secondary domain for are also scanned. I personally don't want this to happen.
The comments in amavisd.conf state:
# With Postfix (2.0) a quick reminder on what local domains normally are:
# a union of domains spacified in: $mydestination, $virtualaliasdomains,
# $virtualmailboxdomains, and $relay_domains.
It's these $relay_domains I don't want.
I can write out all the manually desired domain as per their example:
@localdomainsacl = ( ".$mydomain", '.example.com', 'sub.example.net' );
But maintaining a list of 100s of virtual domains and a handful of local aliases both here and in main.cf would be quite painful.
I tried this which works well for the virtual hosts:
@localdomainsacl = ( ".$mydomain", readhash("/etc/postfix/virtualdomains"));
However, this does not include my local aliases. There doesn't seem to be a hash table where these local aliases are stored, rather they are stored in main.cf as:
mydestination = $myhostname,localhost.$mydomain,etc., etc.
I tried this in amavisd.conf but amavisd wouldn't start:
@localdomainsacl = ( ".$mydomain", "$mydestination", readhash("/etc/postfix/virtualdomains"));
It seems amavisd.conf doesn't understand postfix's main.cf's $mydestination variable.
Does anyone know a non-double-entry method I can use to get virus scanning on these local aliases without including the relay_domains?

This line:
readhash(%localdomains, '/var/amavis/local_domains');
doesn't necessarily need to read from that file at that path.
There are probably 100 ways to do this, and this may not be the best... I haven't tried this solution, but just off the top of my head.....
if what you need is a combinatin of your virtualmailboxdomains and your my_destination, write a script which combines virtualmailboxdomains and postconf mydestination into a single file, then hashes it. Should be pretty straightforward.
Then use:
readhash(%localdomains, '/var/amavis/local_domains');
with correct path of course.
Jeff

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