I previously had the postfix integrated with the spamassassin,
I could see in logs that every mail coming to the postfix is performed by various tests by the spam assassin.
But, when I sent the mail using telnet on the zimbra, in logs I couldn't get any information that the mails had tested by the spamassassin.
Any help regarding this, I am using the opensourse zimbra i.e. zcs-5.0.14_GA_2850.RHEL4.20090303132820.tgz