[exim] Spool size question.

    based on your experience with exim, if I was using
"sender/callout=random" and now for different reasons I must let of use it.
Is normal that the spool 's space on disk is increased in a remarkable way?
    The resources of the micro and memory are without any change.
   Exim 4.34 is running under Fedora Core with spamassassin and clamav.