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What are the security guarantees when emailing someone who does not use ProtonMail? If there is an encrypted mode, can this mode be turned off? This is critical
by Flimm 9y ago
What are the security guarantees when emailing someone who does not use ProtonMail? If there is an encrypted mode, can this mode be turned off? This is critically important, and yet most of these email providers who talk up their security fail to bring it up. This article is the same.
- tonyztan 9y agoFrom the article: "ProtonMail can also support sending/receiving end-to-end encrypted messages with recipients who are not using ProtonMail."
- Flimm 9y agoThe article doesn't make it clear what this support looks like. If it's optional and complicated, people are not going to use it. And if it's different than what ProtonMail uses internally, all the promises about security might not apply.
- dredmorbius 9y agoEffectively, none, as with any messaging outside a secured perimeter. Protonmail doesn't afaict encrypt to external keys (PGP, GPG, SMIME), so you're limited to the remote provider's capabilities and practices. (I'm a Protonmail user.)
- cevn 9y agoWhen you send an email through ProtonMail to an unencrypted user, you have the option to encrypt the email when sends them a link to a webpage prompting them for the encryption password.