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In the iPhone Mail app, I got two mails of the same sender in my "Unknown" folder. I then moved them both to my "Inbox" folder since I trusted the sender. But looking up the inbox, I found only one of the two. I would normally oversee this. But I needed that second mail to work with at once, so that I had to open my mail provider's website online in my iPhone to get it back, and later, I could also read it in Thunderbird and Outlook, but it did not come back in the iPhone Mail app.

These should be roughly about the same thing:

My iOS is 15.7.8 on an iPhone 7.

How can I get this missing email (and if there are, any other missing emails) back to the Mail app?

PS: At least, I did see the later missing mail in the first place. If that holds true for any incoming mail, I should just read all mails in the first place where they come in or check any needed mail that I moved in its new folder. Therefore, this bug is not as bad or dangerous as it sounds. When I search through my mails in my iPhone Mail app, I should still keep in mind that there might be some very few mails missing in the search output.

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  • I presume you have deleted ALL accounts on the phone and re-added them? Failing that I would be tempted to back-up, wipe and then restore the phone, with no mail accounts added to the Apple mail.app. Wiping the phone deletes temporary files and in some cases I have found it helps with apps acting wonky. Sep 4, 2023 at 21:18
  • @SteveChambers Ah that "turn off and on" again thingy :). Yes, I guess you are right about it: if I removed all of the accounts and added them again, I am quite sure that all of the mails would be in there, since this was just an error "on the run". This is most likely the only answer. See the Emails Received but not Visible in Inbox with IOS 10 on iphone with 192 finding the question helpful and nobody finding the answer helpful. If you answer, I will accept. Sep 5, 2023 at 9:22

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Delete ALL accounts on the phone and re-add them. I have found that one troubleshooting step in mail.app to fix a multitude of issues.

Failing that I would be tempted to back-up, wipe and then restore the phone, with no mail accounts added to the Apple mail.app. Wiping the phone deletes temporary files and in some cases I have found it helps with apps acting wonky.

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