Clarify email criteria

[jonaharagon]

https://discuss.privacyguides.org/t/relaxing-email-tls-requirements-on-smtp-port-25/1938/6?u=jonah

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[privacyguides-bot]

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

https://discuss.privacyguides.org/t/relaxing-email-tls-requirements-on-smtp-port-25/1938/12

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[KaiTebay]

Suggested minor grammatical fixes. Otherwise, 👍

[KaiTebay]

LGTM!

[privacyguides-bot]

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

https://discuss.privacyguides.net/t/v2-28/8091/1