Maybe your spamassassin taking too much cpu or have some "out of memory" problem...
See this tips to get spamassassin to run faster/better: http://wiki.apache.org/spamassassin/FasterPerformance Sebastian Ries escreveu:
Hi I have this problem about once a month: Spamassassin works without problem but suddnely spamd stops running. All I see in the logfile is: Apr 11 13:12:56 extmail spamd[20273]: spamd: server killed by SIGTERM, shutting down after that spamc cannot connect to spamd... I don't find anything that could cause that. Does anyone have some hints? Regards Sebastian Ries