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UIWebView Data 

Defines the types of information that can be detected in text-based content.

enum {
    UIDataDetectorTypePhoneNumber   = 1 << 0,
    UIDataDetectorTypeLink          = 1 << 1,
    UIDataDetectorTypeAddress       = 1 << 2,
    UIDataDetectorTypeCalendarEvent = 1 << 3,
    UIDataDetectorTypeNone          = 0,
    UIDataDetectorTypeAll           = NSUIntegerMax
};
typedef NSUInteger UIDataDetectorTypes;

See UIKit Data Types Reference

Respond to mailto: 
myWebView.dataDetectorTypes=UIDataDetectorTypeAddress;

See also UIWebView Reference

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