MFMailComposeViewController duplicate email

Number:rdar://FB9083019 Date Originated:19/04/2021
Status:Open Resolved:
Product:macOS Catalyst Product Version:iOS 14
Classification:Unexpected behaviour Reproducible:Yes
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.

Sample code:

import UIKit
import MessageUI

class ViewController: UIViewController, MFMailComposeViewControllerDelegate {
  override func viewDidLoad() {

  override func viewDidAppear(_ animated: Bool) {
    if !MFMailComposeViewController.canSendMail() {
      print("Cannot send mail")
    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)


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