Exclude recipients from pre-queue spamass-milter checks?

[Wolfgang Zeikat]

We are experimenting with spamass-milter to check mails and reject them 
if a configured spamassassin score is reached. That part works, but the 
milter is (of course) applied to all mails after our 
smtpd_recipient_restrictions lookups return OK for the recipient, i.e. 
also postmaster@<various domains> for whom we want to accept every mail.

Is it possible to exclude mails from
smtpd_milters = unix:/var/run/spamass.sock?
Regards,

wolfgang