Improve email criteria

[jonaharagon]

I mainly want to split our email providers between services which are built for OpenPGP message encryption and those which are not. I think that's the main differentiating feature people are looking for here.

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[dngray]

This does make sense.

[privacyguides-bot]

This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/v2-33/11842/1