On Windows 8 the new mail client always adds the following to new emails and replies:

 

“Sent from Windows Mail”

 

This is a pet peeve, so I want to disable this.

 

  1. Open the mail client
  2. WIN+I to bring up the app settings
    image
  3. Select Accounts and then click the account in question.
    image
  4. In the settings for the Account, either change the signature or deselect the option to use an email signatureimage

 

Tada!