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Replying to
There is a way to export a single message as a .eml file:
You can use the Message > View Raw Source menu item, and then use File > Save to export an email as .eml
But no way to do this in bulk, like exporting a full mbox file, and isn’t on our short-term roadmap.
Replying to
To export all of your email from Gmail, you may be interested in looking at Google Takeout, which allows you to export an mbox of your entire account:
takeout.google.com
I hope that helps!