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Up to now SpamPal is a proxy only which cannot delete mails. I think that at least the IMAP4 proxy includes a feature (check, tag and upload mail to IMAP4 spam-trap) which should make it quite easy to add a delete function.

The Spam Confidence Level feature has already been mentioned as request. Our approach could be to give a certain score and weighting to all plugins, wls and bls and mark a message as spam if the cumulated score is over a threshold. All of that should be user configurable.

In this particular case I suggest disabling the catch-all feature and only get mails for existing accounts. I had to take the same step after I had received thousands of spam mails per day to non-existing email addresses within my various domains.