Spam useage of plugin

Can a blacklist be added to the plugin? Here is the thought… A form field that allows single words or single entries per line separated by comma. Then before the email gets sent out a simple foreach can be done against the list. If a match is found, the email is not sent. If no match is found, the email gets sent. Perhaps you can have the plugin use the comment blacklist that is already in wordpress… It would help the plugin be more secure.

Thanks

Steve