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FOSS email providers?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
The Mail Plus version of the Password Manager doesn't have any option for 2FA unfortunately, only if you pay for unlimited (US$12/mo).