To test Spamassassin it is necessary to send a test mail containing the following string of characters (in upper case and with no white spaces and line breaks):
XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X
KB Parallels: [How To] How to test Spamassassin