Scan your mail server IP or domain against 13+ major email blacklists including Spamhaus, SpamCop, and Barracuda.
An email blacklist (DNSBL) is a real-time list of IPs or domains reported for sending spam. Mail servers check these to decide whether to accept, reject, or quarantine incoming email.
Each blacklist has its own delisting process. Fix the root cause (open relay, compromised account, spam complaints), then submit a delisting request on the blacklist provider's website.
Common causes: sending spam or unsolicited bulk email, compromised account, running an open relay, sharing an IP with a spammer, or missing SPF/DKIM/DMARC authentication.