import.m

<MFMailComposeViewControllerDelegate>
UIMessage.framework

mailComposeController:didFinishWithResult:error;.m

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    switch (result)
    {
        case MFMailComposeResultCancelled:
            
            break;
        case MFMailComposeResultSaved:
            
            break;
        case MFMailComposeResultSent:
            
            break;
        case MFMailComposeResultFailed:
            NSLog(@"Mail sent failure: %@", [error localizedDescription]);
            break;
        default:
            break;
    }
    [self dismissViewControllerAnimated:YES completion:NULL];
}

MFMailComposeViewController.m

if ([MFMailComposeViewController canSendMail])
            {
                NSString *emailTitle = @"";
                NSString *messageBody = @"";
                NSArray *toRecipents = [NSArray arrayWithObject:@"[email protected]"];
                
                MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
                mailViewController.mailComposeDelegate = self;
                [mailViewController setSubject:emailTitle];
                [mailViewController setMessageBody:messageBody isHTML:YES];
                [mailViewController setToRecipients:toRecipents];
                
                [self presentViewController:mailViewController animated:YES completion:NULL];
            } else {
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure"
                                                                message:@"Your device doesn't support the composer sheet"
                                                               delegate:nil
                                                      cancelButtonTitle:@"OK"
                                                      otherButtonTitles:nil];
                [alert show];
            }