Blue Security has given up fighting for its Blue Frog and Do Not Intrude Registry free anti-spam services after they’ve suffered gruesome attacks from spammers. The Blue Frog service, and the attached Do Not Intrude Registry, seemed as a gift from heaven for all those who were fed up with all that spam e-mail filling their computer mailboxes. Soon after the Do Not Intrude Registry collected more than 450 thousand members, spammers began to send out spam threatening to flood members if they do not unsubscribe from the Blue Frog service. He first launched a denial of service attack against Blue Security website and managed to get it invisible to the rest of the world (only people in Israel, country of Blue Security origin, could access the site).