HeaderCheck
Support
Quick help for the on-device email authentication analyzer.
What HeaderCheck does
HeaderCheck shows plain-language SPF, DKIM, and DMARC verdicts from pasted headers or an .eml file. Everything runs on your iPhone or iPad. There is no account and no upload to a developer server.
How to get headers on iPhone
Apple Mail does not show raw headers in a convenient copy field. A reliable path is to forward the message as an attachment (or use Share / Open In) and open the .eml in HeaderCheck. In Gmail or iCloud on the web, use Show original / view message source, then paste into the App. The in-app Learn tab walks through these steps.
Free and Pro
Paste and core verdicts are available on the free tier. HeaderCheck Pro is a one-time purchase that unlocks PDF export, analysis history beyond the free cap, and .eml import. Purchases are handled by Apple.
Contact
Email HeaderCheck@mclarty.me with the device model, iOS version, and a short description of the issue. Do not send full email headers or message contents unless you intentionally want help reviewing a specific sample.
Privacy
See the HeaderCheck Privacy Policy for how data is handled.