Send Mail from Another App
Quite a few apps, such as Safari, Contacts, Maps, and Notes, have a button or link for sending an email message containing some relevant data (a link to the Web page you're viewing, your location, the contents of the note you're reading, or whatever). When you tap such a control, you see the standard outgoing message screen, pre-filled with whatever information the originating app thought was important. To send the message, you need only add or edit text as you see fit, address the message (or edit any existing addresses), and tap Send.
Some apps embed mail-sending capabilities whereas others send you to Mail. The interface for sending the message is the same in both cases, but with an embedded mailer, the original app ...