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Cake day: July 7th, 2023

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  • Labels/Tags are a product feature, not part of email standards. Meaning: it’s not a thing when looking at the raw mail server data.

    Each product handles this in their own way, and the tool being used to export your mail from one host/product to another would be what is handling that, if at all. Gmail probably just uses folders because that is part of the structure a mail server would have.

    I believe Proton’s import tools handles this correctly from Gmail using both labels as folders and preserving tags, but I believe Thunderbird just puts them in folders as is standard.

    You can double check by looking at the raw data exported from any mail service. You could probably easily write a quick script to handle getting tag info and applying it yourself, though it could be quite slow.