Domain Blacklist Checker
Check a domain against the IsEmailSpam blacklist before trusting a sender, link, signup, or contact form submission.
What this checks
The checker searches public IsEmailSpam domain listings that are active and old enough to be published. Results show matching domains and their first seen dates when available.
How to use results
A listed domain is one signal, not a final verdict on every message from that domain. Review the sender, message context, links, and authentication signals before deciding whether to trust it.