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Using MFMailComposeViewController for sending emails in a Mac Catalyst app sends the email twice. I created an empty sample app to check, got the same results. The same code works fine on iOS (email only gets sent once). I use a Google account for my mailing on both platforms. Am I doing something wrong? Any suggestions? My code: Swift import UIKit import MessageUI class ViewController: UIViewController, MFMailComposeViewControllerDelegate {   override func viewDidLoad() {     super.viewDidLoad()   }   override func viewDidAppear(_ animated: Bool) {     super.viewDidAppear(animated)           if !MFMailComposeViewController.canSendMail() {       print("Cannot send mail")       return     }     let composeVC = MFMailComposeViewController()     composeVC.mailComposeDelegate = self     composeVC.setSubject("Test subject")     composeVC.setMessageBody("Test body", isHTML: false)     self.present(composeVC, animated: true, completion: nil)   }   func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {     controller.dismiss(animated: true, completion: nil)   } }