domain name system-based blackhole list, or dnsbl, is a spam prevention technique. it tracks ip address that send spam and publishes a “blacklist” of addresses linked to spamming. most mail servers can be configured to reject or flag messages which have been sent from a site listed on one or more dsnbls. if your mail servers are added to a dnsbl database, it can cause other companies to deny email delivery from those servers.
we continuously query major dns blacklist databases for any ip or hostnames you specify. if the hostname is found, our solution triggers an instant alert. dnsbl monitoring gives you peace of mind and assures you of a quick recovery if your domain is ever listed.