Forum - ignored user

hello admin
why some hobbyist (indian,time waster, lot of emails sender.....)who i put on my ignore listing can send me email via your web site or simply get my private email.
so my question what is the real fonction of this buttom called "ignore user"
thanks in advancefor a reply
kate

Thanks for reporting. We'll fix this bug asap. The ignored user must be unable to contact you.