Adding and verifying a 'from email'.
To add and verify a 'from email', do the following:
Step 1: Go to the top-left side of your dashboard. Click on My Emails, a new interface will show.
Step 2: Go to the bottom of the My Emails page, enter a preferred 'from email' and click on the Add Email button.
Note: Only custom domain emails can be added as a 'from email', as the picture above has shown.
Step 3: Go to your inbox to verify the email entered.