[Plugin: Another WordPress Classifieds Plugin] keyword notify

Hi,

Thank you for providing this great plugin! I’m setting it up now and thinking about features I would like to have included. It would be nice for viewers to be able to set up keyword notify so that whenever an ad that interests them is posted, they would automatically get an e-mail. Is this possible?

http://wordpress.org/extend/plugins/another-wordpress-classifieds-plugin/