Add your badge to your email signature, and everyone you email can click it to see your credential and check it is genuine.
This works best with badges. Certificates are usually too large for the bottom of an email.
Before you start
You need to be logged in to your Certify account to see the option. See How do I log in to see my credentials?
Add your badge to your signature
Log in at app.certify.one and open the credential page of the badge you want to use.
Below the badge image, click Embed.
Follow the instructions shown for your email service, Gmail or Outlook. In short, you copy the badge and paste it into your email signature settings.
Save your signature and send yourself a test email to check it.
Where to find your signature settings
Gmail: Settings, then See all settings. The Signature section is on the General tab.
Outlook: Settings, then Account, then Signatures.
Tips
One or two badges is plenty. More than that can make your signature look cluttered.
If a badge expires, remove it from your signature so you don't show out-of-date proof.