[exim] disable spam check for hosted domains and users

How i cant do it?

I have this rules

  deny message   = This message scored $spam_score spam points. See
http://www.sput.nl/spam/
        spam      = spamd:true
        condition = ${if >{$spam_score_int}{50}{1}{0}}

and is possible disable spam check if the message is bigger than 1 M