OperaMail .eml and mbox import/export
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burnout426 Volunteer last edited by
Opera mail already has mbox import/export support. See https://www.reddit.com/r/operabrowser/wiki/m2tips/export_messages.
Also, when you ctrl + s to save a single message, it saves it as an mbox file. You can edit the file with a text editor and remove the "From " line at the top. Then, you can rename the file to have a .eml extension and you have an eml file. There are also mbx2eml and em2mbx converters on the net.
For importing mbox, see "Menu -> settings -> import and export -> import mail -> import generic mbox". See https://www.reddit.com/r/operabrowser/wiki/m2tips/import_from_thunderbird as an example.