Many people here use Wordfence without any issues. We're sorry that you obviously have. If you are still getting emails from an uninstalled plugin you might do well to check your mail queue. The emails might just be stuck there, after a bot brute force attack and trickling out. Here's info on that.
http://www.pc-freak.net/blog/list-mail-queue-qmail-sendmail-postfix-exim-smtp-server/
tim