Check whether a mail server IP or domain is listed on 18 major spam blocklists (DNSBLs). Free blacklist checker from Total Group.
An email blacklist (DNSBL) is a list of IP addresses and domains known to send spam. If your mail server is listed, many recipients will reject or junk your email.
Find and fix the cause first, such as a compromised account, an infected device or an open relay, then request delisting from the list owner. Most lists remove you automatically once the spam stops.
