class ContactViewController: UIViewController, MFMailComposeViewControllerDelegate {

override func viewDidLoad() {
    super.viewDidLoad()
}

@IBAction func emailSenden(_ sender: Any) {

    if !MFMailComposeViewController.canSendMail() {
        print("Mail services are not available")
        return
    } else {
            let mail = MFMailComposeViewController()
            mail.mailComposeDelegate = self
            mail.setToRecipients(["someone@example.com"])
            mail.setSubject("Message to you")
            mail.setMessageBody("Hallo,n", isHTML: false)

            present(mail, animated: true, completion: nil)

            mail.dismiss(animated: true, completion: nil)
            }

    }
}