If you are using amavis then you are probably not using spamd with auto-learn.    Assuming that’s the case, then you need to know a few things to teach the spamassassin component of amavis when it misses spam or misclassifies ham (good mail) as spam. I use Ubuntu(+postfix+amavis+opendkim+postgrey) as a front end for my Microsoft Exchange Server.  So, I…