How to Check if your IP is blocklisted

Here is how to check if your IP is blocklisted, step by step.

The steps

Query major DNSBLs (Spamhaus, Barracuda, SORBS) for your sending IP and domain, and use MXToolbox-style checks to find and fix listings.

Why it matters

Getting this right is part of landing in the inbox instead of spam. See the full deliverability checklist.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI that watches your list health and deliverability — and it welcomes the senders Amazon SES, SendGrid and Mailchimp reject, from $8. Run the free 10-second checker or see plans.