Running Apple Mail 6.0 with 10.8 and SpamSieve 2.9.3
I had a message in today which SpamSieve sent incorrectly* to my Spam folder and so, with relevant message highlighted, I went to the 'Message' menu in Mail, and then clicked on 'SpamSieve - Train as Good'. This action hung Spamsieve - I saw in marked as 'Application not responding' having pressed the ⌘+⌥+⎋ keys. Although Mail.app itself was NOT marked as 'not responding', it had also hung and I had to force quit that too as well as SpamSieve.
I tried installing the Apple Mail Plug-In from the SpamSieve menu again - no difference.
* Interestingly, I had had two previous messages from this email address today, which went correctly to my Inbox, and had replied to one of them which in turn had been replied to and it was this latter message which was incorrectly delivered to my Spam folder. Weird.
Any ideas, Michael?