If you sign your messages with DKIM/DomainKeys, you can:
Tip: For information about DKIM/DomainKeys, see DKIM/DomainKeys Overview.
If your messages are signed, the Standard Message report displays the Authentication section as shown in the following illustrations.This section does not appear if the message was not signed.
The DKIM/DomainKeys section in the Message Summary section on the Schedule Message page shows the selector and domain of the message signature as shown in the following illustration. This section also show errors in your DKIM/DomainKeys setup.
To see the actual message signature, send a message to Yahoo's DomainKeys auto responder at email@example.com. The auto responder will respond with an email that states: Your message has been verified. The response shows all headers in your original message, including the DomainKeys-Signature header with the message signature.