I used MFMailComposeViewController to send email.
It always add the email to email queue.
If my email has large attached file, it will take a long time to send out.
Is there a way to make sure email has been sent?
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Sadly, no, there is no way to make sure the email has actually been sent.
The best you can do is in
mailComposeController:didFinishWithResult:error:in yourMFMailComposeViewControllerDelegatecheck the result is equal toMFMailComposeResultSent, and this will tell you the email is queued to be sent.