Have you wanted to send an e-mail from your app and pre-populate the fields like the recipient, subject, or body text? In this How to send emails from your ios application tutorial I will show you how. Thankfully Apple made it pretty easy with MFMailComposeViewController. There is a bit of setup, but most of its actual implementation is pretty easy.
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This Quick iOS Development tip is a piece of code that I use regularly to validate an email address.