i currently use tuta. it has a free tier, offers encryption, is open source, gdpr-compliant, and is 100% powered by green energy.

i have used mailbox in the past, which is paid (cheapest tier is ~€12/yr). i can recommend it as well.

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nausicaä and the valley of the wind. environmentalism shows up a lot in miyazaki’s work, but nausicaä is the most direct about it and aligns with solarpunk in its messaging and themes.