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How do I include or delete a contact in the blacklist.

To delete a contact:
If you want to remove blacklisted users from blacklist, simply click on Tools -> Rules, Double-click on the Blacklist item, click on the Remove button and the action is complete.
To include:
Mark the mail, right mouse click, then you can decide from three following moves: Move to Junk, Move to Junk and blacklist email, Move to Junk and blacklist domain.

Thanks, Huber,

Hello Idacil Amarilho,
Thanks - glad when it works out.