Email supports end to end encryption between any two servers. You set each server up with a list of supported protocols and denied protocols.
If either side can't agree on the encryption algorithm, then the email does not go through.
If both sides do agree, which is almost always the case if both sides are using industry standard encryption methods, then the email is end to end encrypted.
On top of that, we have PGP encryption which allows the user to encrypt the email from everybody including the email provider. Only the recipient email address and possibly the subject line would be readable to the email providers.
As for the IP, if protonmail removes the sender's origin IP then it's removed and that's it.
Email is one of our best methods of international communication available today.
There aren't many services that support e2e encryption though. I've been a Protonmail user for years and only remember being able to send encrypted emails to other PM users, maybe Fastmail also supports the same protocols?
Regardless, if I'm not mistaken encryption protocols are layered on and not part of the official email spec. I'm not 100% on that so may it was added to the spec as an optional feature, but by no means is it common (especially with the market share Gmail owns).
Yes, but all emails exchanged between two Proton accounts, as well as between a Proton account and a non-Proton user who relies on PGP encryption, are protected by PGP.
But there's also server side encryption that is end to end. If both the sender and recipient uses a trusted mail server that uses encryption then nobody between the two can see the email.
Email supports end to end encryption between any two servers. You set each server up with a list of supported protocols and denied protocols.
If either side can't agree on the encryption algorithm, then the email does not go through.
If both sides do agree, which is almost always the case if both sides are using industry standard encryption methods, then the email is end to end encrypted.
On top of that, we have PGP encryption which allows the user to encrypt the email from everybody including the email provider. Only the recipient email address and possibly the subject line would be readable to the email providers.
As for the IP, if protonmail removes the sender's origin IP then it's removed and that's it.
Email is one of our best methods of international communication available today.