In addition to @woz's answer, this is the point that can help you.
In my application, I have a feedback form so that users can contact me. Unfortunately, many users had minor spelling errors in their email addresses, and I could not contact them.
Since I could not get the perfect way to make sure the letter was correct, I developed the following text, which:
- claims mail is valid foo@bar.tld
- verifies that the message is in the user's address book
- If not, suggest the closest match.
Again, this is far from ideal, and I turned on this behavior (a small "check mail" button next to the UITextField)
https://gist.github.com/dirtyhenry/7547064
Dirty Henry
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