AM.WBL?

[Thomas Barth]

Hello,

I got a false positive because the test AM.WBL results in score 7. It 
was a mail by email.apple.com (a bill). What is AM.WBL? I cant find it 
in the test list: https://spamassassin.apache.org/tests_3_3_x.html

Do I have to set "score AM.WBL 0"?