I’ve been using Spamsieve for several years now, and have been very happy with it and recommend it to others consistently. I finally decided to ask about one persistent glitch.
I pretty consistently get false positives (i.e., good mail filtered to Spam mailbox) from one particular source: the episodic news and special offers e-mails from Apple. Every time this happens, I highlight the message and press <Command> <Control> g and it moves to the inbox. But the next mailing goes to the Spam box anyway.