DNSBLCheck.co.uk is a fast and free service to check your mailserver IP address against many DNS blacklists and spam databases at once.
If we are missing a DNSBL please drop us a note and let us know.
A DNSBL is list of IP addresses published through the Internet Domain Name Service in a particular format. DNSBLs are most often used to publish the addresses of computers or networks linked to spamming; most mail server software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.
If sending email is vital to your business you should ensure that your emails are not being blacklisted by one of the many DNSBLs out there. This quick and simple service allows you to manually check for listings on the most popular and widely used DNSBLs.