To send an email from another email address other than the one you typically send from:
- Open a new email message.
- Click on the From dropdown.
- Click Other E-mail Address...

- In the box next to From, type in the email address you want to send from.

- Finish composing your email and click Send.
- When the email is received, it will show as being sent by this different email address.

- To try this out, send a test email to your normal email address but send it from another email address.