Check If an Email Address or Domain Is Spam
What it checks
IsEmailSpam checks the exact email address and its sender domain against active public blacklist records, disposable-email data, and user-submitted spam reports.
How to use the result
A match is a warning signal. Review the sender, message context, links, and authentication details before deciding whether to trust or block the email.
For apps and workflows
Use the REST API to add spam checks to signup forms, contact forms, moderation queues, and internal fraud-review workflows.
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Frequently asked questions
How do I know if an email is spam?
Enter the sender's email address in the checker above. We match it against our database of known spam emails and domains, which is updated daily from public spam and disposable-email blocklists plus user reports.
What makes an email address or domain get blacklisted?
Addresses and domains are added automatically from daily-updated public spam and disposable-email blocklists, or manually after a user reports them as spam.
How often is the spam database updated?
Our database is refreshed daily, so newly reported spam domains and email addresses are reflected quickly.
Is the email spam checker free to use?
Yes, checking an email or browsing the blacklist is free. A REST API is also available for developers who want to check emails programmatically.
What if my domain or email was blacklisted by mistake?
You can dispute a listing from its blacklist page after logging in. Submit your dispute and our team will review it.