Free DNSBL & IP Blacklist Checker
Query major anti-spam RBL/DNSBL databases to verify your domain IP address is not blacklisted.
Email Blacklist (DNSBL) Checker
Check whether your domain's mail server IP address is listed on major anti-spam blacklists.
Impact of DNSBL Blacklisting
If your IP address or sending domain appears on a DNSBL list, recipient mail servers may automatically reject or mark all your outgoing emails as spam.