[exim] spamassassin

Is possible define a timeout time?

I have some zombie process how this:

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
28862 spamd     25   0  461m 380m 5408 R 99.9 37.6  52:59.35 spamd