[Mimedefang] no free slaves...

[Charles Mount]

I am running four SUN 420s with 4 processors and 4GB, solaris 8,
sendmail-swtich, and mimedefang 2.39 which calls spamassassin.
Last week we handled about 12.5 million email messages.   Which is a clear
overload for these servers.   The load average stays above 20 for much of
the day.    It looks like we have an even higher volume this week.

I have increased to MAX_SLAVES=60.  I still get a lot of   "No free slaves"
messages in the log file.
It is clear that I am using MAX_SLAVES=60 to limit the number of
connections.   I am not sure thats a bad thing, since the servers cannot
work much harder.

Does anyone have any wisdom on tuning an over worked server?

Thanks