UIApplication *theApplication = [UIApplication sharedApplication];
NSString *recipient = [NSString stringWithString:@"someone@somewhere.com"];
NSString *subject = [NSString stringWithString;@"The subject line"];
NSString *body = [NSString stringWithString:@"This is a really dull email. Sorry."];
NSString *s = [NSString stringWithFormat:@"mailto:%@?subject=%@&body=%@", recipient, subject, body];
NSString *mailString = [s stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [[NSURL alloc] initWithString:mailString];
[theApplication openURL:url];