FWIW, Sendmail 8.12.9 (and possibly prior versions) supports a limit:
define(`confMAX_DAEMON_CHILDREN', `24')dnl
All that does is limits the number of simultanous children the main sendmail process will launch in response to incomming connections on port 25, it has nothing to do with the maximum number of simultaneous local deliveries, since they can be triggered by queue runners as well.
So if you call spamassassin from procmail this does no good at all, if you call spamassassin from a milter this will indeed place a limit on concurant scanning, however it will also cause connections to be rejected when this limit is reached. (As well as that, 24 simultaneous spamassassin processes is enough to bring most machines to their knees)
Regards, Simon
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