Blacklist · RBL_LISTED

Domain or IP on a blocklist (RBL_LISTED)

Your domain or sending IP appears on a public blocklist. Learn how to find the cause, pause risky sending and request delisting.

What it means

The domain or a related sending IP was found on at least one public DNS-based blocklist (RBL/DNSBL) that receivers use to filter mail.

Why it matters for sending

Receivers that use the listed blocklist may reject or filter your mail. Listings usually follow spam complaints, sending to spam traps or invalid addresses, or a compromised account.

How to fix it

  1. Pause campaigns from the affected domain or mailboxes.
  2. Open the blocklist’s own lookup page to read the listing reason.
  3. Fix the cause: clean the list, remove unverified contacts, check for compromised accounts and review recent volume.
  4. Request removal through the blocklist’s official process; do not pay third parties for delisting.
  5. Resume slowly with lower daily limits and re-run the deliverability checker.
Check your fix Cold Email Deliverability Checker Related guide Why Cold Emails Go to Spam

Sources

This page is based on public standards and provider documentation, reviewed on 2026-09-25.

MailQV checks the domains of your connected mailboxes automatically.

When you connect a mailbox, MailQV checks SPF, DKIM, DMARC, MX and blocklist status and warns you before a campaign if something is wrong.

Start free