The blacklist test will check a your IP habitat adjoining DNSBL based blacklist servers. (Commonly called Real-time blacklist, DNSBL or RBL). If your IP server has been blacklisted, some email you send may not be delivered or you cannot entry some valid times websites. Email blacklists are a common habit of reducing spam. By entering the IP blazing of your website server, mail server or ISP IP quarters in the above search arena, you will be redirected within few seconds to neighboring page, where you will be notified even your IP domicile is blacklisted or not. If your IP residence is blacklist vis--vis any DNSBL, you can conveniently click once reference to listed DNSBL in blacklist option and there you can locate all recommendation not quite DNSBL and with the removal colleague vis--vis that page. If you don't know your mail server's address, begin here.