Email Blacklist Checker
Scan your mail server IP or sending domain across major DNSBL and RBL reputation databases to identify deliverability blocks and delisting steps.
How do email blacklists affect your business?
Email blacklists (DNSBLs) are public databases maintained by cybersecurity organizations that flag IP addresses and domains suspected of distributing spam, malware, or phishing.
Immediate Delivery Drops
Being listed on a top-tier RBL like Spamhaus ZEN will cause providers like Gmail, Microsoft Outlook, and Yahoo to reject your emails with 550 SMTP hard bounce codes.
Shared IP Hazards
If you send from cheap shared hosting or multi-tenant mailers, another spammy tenant's behavior can get your IP blacklisted, dragging your deliverability down.
Delisting Process
Most blacklist providers offer self-service delisting after you fix the root cause (e.g. stopped compromised accounts, cleaned unsubscribes, or enabled double opt-in).
Automate your email deliverability
Mailofly provides automated DKIM rotation, dedicated IP pools, and zero-downtime multi-provider failover. Send your first 10,000 emails free.