In your experience, what is a good ‘certain spam’ threshold? By that I mean the score above which messages are virtually always spam, no false positives.
The default threshold for spam is 5.0, which works well for me. Only very rarely a ham message scores above that and lands in my Junk folder. Would 10.0 be a good ‘certain spam’ threshold? 15.0? I could then reject such messages at the SMTP layer, without having to worry about rejecting legitimate messages. Thank you!