MacOS – Save email on disk

backupemailmacos

I'm using Fastmail and its web interface as my email client and I'd like to clean it up but save multiple hundreds of emails to some text-based format.

Is there any macOS email client or utility that can do it?

Best Answer

You can use Mozilla Thunderbird, with ImportExportTools plugin.

If you need a step by step guide, here is one with images, is quite old, but gives the idea. Use software/plugin from Mozilla site.