To browse email, tap Email in the left-hand navbar.
Email lists all emails you have sent with the most recent at the top. If you clear your name from the By filter, it will list all sent email messages.
You can open any email from this list and reuse it like an email message template, just update the recipients and make any other minor changes and click send.
If you check the boxes to the left of messages, you'll get the Actions menu, which gives you the option to Delete all the selected messages.