Free · runs in your browser

List-Unsubscribe Validator

Check List-Unsubscribe header shape.

How it works

List-Unsubscribe Validator

Check List-Unsubscribe header shape. Runs in your browser — you can email the result.

Results appear here after you click Run.

Ready to send from your product? MailShrine Developer API uses the same DNS, webhooks, and SMTP patterns this tool inspects.

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