Since 3.0, many more false negatives getting through (ie, more spam)

[Michael_Tsai]

@Michael_Tsai

Most likely, you are running into the Mail bug described in Why are Apple Mail inbox messages not being processed? that affects extensions. You can work around the bug by adding your inbox to Filter spam messages in other mailboxes .

SpamSieve 3.0.1b2 can now automatically filter new messages in the inbox that Mail failed to send to the Mail extension. So, in most cases, you no longer need to do anything to work around this Mail bug.