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Find your DKIM selector from an email header

A signed email names its selector. Paste the header of one you sent, and we will read the selector and hand it to the DKIM checker.

The header is read in this browser and never sent anywhere. This page loads only its own scripts and sends nothing to another site. Once it has read a selector, it asks our API for that one public key — sending the domain and the selector, nothing else from the header — and checks the signature here, in your browser.

How to copy an email's raw header

Use an email sent from this domain, not one you received. The easiest: send one to another mailbox you can read (a personal Gmail, say), open it there, and copy its headers.

Pasting the whole message is fine: only the header — everything above the first blank line — is read, and the rest is dropped unread.

Gmail — vendor's help page, as of 2026-10-06

  1. Open the message.
  2. Next to Reply, choose More, then Show original.
  3. In the new window, choose Copy to clipboard.

Outlook on the web, Outlook.com and new Outlook — vendor's help page, as of 2026-10-06

  1. Open the message.
  2. Select More actions at the top of the message, then View, then View message details.
  3. Copy everything in the box.

Classic Outlook (Windows) — vendor's help page, as of 2026-10-06

  1. Double-click the message, so it opens in its own window.
  2. Choose File, then Properties.
  3. Copy everything in the Internet headers box.

Apple Mail (Mac) — vendor's help page, as of 2026-10-06

  1. Select the message.
  2. Choose View, then Message, then All Headers.
  3. Select the header block and copy it.

Menus move; these steps are dated snapshots of each vendor's own instructions.