Email Blacklist & Reverse DNS Checker
Emails bouncing or going to junk? Check whether your mail server's IP address or your domain is on the blocklists that email providers use, whether its reverse DNS is set up properly, and how to get removed.
- 12 blocklists
- Reverse DNS check
- Domain and mail server
If you're listed
- Find the cause first: a hacked mailbox or website sending spam, an infected computer, an open relay, or a marketing campaign to old addresses. Delisting without fixing it just gets you listed again.
- Then request removal using the list's own page (linked in the results). Many lists, like SpamCop and PSBL, remove you automatically after a while once the spam stops.
- Microsoft 365 and Google Workspace send from shared addresses, so a listing of their servers isn't usually yours to fix. If your own messages are blocked, check your SPF, DKIM and DMARC with the Email Security Checker.
Reverse DNS and policy lists
- Mail servers need reverse DNS (a PTR record) that points to a proper name, which in turn points back to the same IP. Many receivers reject mail without it. Your hosting or internet provider sets it, not your DNS host.
- Spamhaus PBL lists home and dynamic broadband addresses that shouldn't send email directly. That's normal for an office or home connection, and only matters if you run a mail server there. Send through your email provider instead.
- Some smaller lists (like UCEPROTECT levels 2 and 3) list whole networks and are used by few providers. A single minor listing rarely affects delivery.