[exim] authenticated users in exim router

Hi,

I have the following in my spamcheck_director..

spamcheck_director:
   driver = manualroute
   domains = ${lookup mysql {MYSQL_Q_SPAMC}{$value}}
   senders = ! ${lookup mysql {MYSQL_Q_WHITELIST}{$value}}
   condition = ${if and { \
     {!eq {$received_protocol}{spam-scanned}} \
     {!eq {$received_protocol}{local}} \
     } {1}{0}}
   headers_remove = X-Spam-Flag
   route_list = "* localhost byname"
   transport = spamcheck
   verify = false

But I would like to add a line so that I do not spamcheck mails from
people who have authenticated to send the message..

is this possible?

Jonathan