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I was trying to set up Apple Mail on my Mac because someone emailed me a .eml file that I seem to need Apple Mail in order to open. When I tried setting up my Gmail account in Apple Mail, it asked me to give permission for the app to read, edit, and delete emails.

What I Want To Know: Under what circumstances would Apple Mail actually delete my emails from a Gmail account that I set up with it? Would it only be when I manually delete them in the Apple Mail app?

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    You shouldn't have to set up an account to read a single email file. – Allan Oct 21 at 16:53
  • Answering your secondary question: Giving permission to Apple Mail for your Google account should be fairly safe. Apple Mail only deletes mail you tell it to. I've set my G Suite and Google Accounts to read in Apple Mail many times through the years without incident. Unless you think you'll use Apple Mail, I would probably skip the setup as Allan mentions. – wizdomonwheels Oct 22 at 0:28
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The .eml file is a mail file that is based on the MIME RFC 822 specification. It's basically a text format that pretty much all Mail applications can open

  • Outlook (macOS, Windows, iOS, Android) / Outlook Express (Windows Only)
  • Microsoft Mail (Windows 10)
  • Apple Mail (macOS)
  • Mozilla Thunderbird

Regarding your question, you don't need to setup a Gmail acccount (or any account for that matter) to read a single .eml file. If it asks you to set one up, just skip it.

You can also open a .eml in your browser. Simply rename the file with an .mht extension. Assuming the file is on your Desktop, using Terminal

% mv ~/Desktop/foobar.eml ~/Desktop/foobar.mht

Then open with your browser. If it's only text, any browser will work, but if it has embedded images, Chrome or Microsoft Edge will natively display it (I prefer Edge over Chrome as it uses the same engine, but I distrust Microsoft less than I do Google).

Microsoft Word will natively open both a .eml and the .mht. If you don't have Word, you can open it with the free web version of Word. You just need to create a free Microsoft account.

As an example, I got an old .eml file (an Uber receipt) and tested. It opens natively in

  • Outlook for macOS
  • Apple Mail
  • Microsoft Word
  • Edge/Chrome (as a text file)

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