Comment by cfn
The contents of the emails are encrypted so you have a normal login plus a key to unencrypt your email locally. They save your encrypted email conyents and your login but not the key and they also don't log your access (I'm assuming here from reading the article).
They might log access in some circumstances, according to their privacy policy (https://proton.me/legal/privacy)
> 2.5 IP logging: By default, we do not keep permanent IP logs in relation with your Account. However, IP logs may be kept temporarily to combat abuse and fraud, and your IP address may be retained permanently if you are engaged in activities that breach our Terms of Service (e.g. spamming, DDoS attacks against our infrastructure, brute force attacks). The legal basis of this processing is our legitimate interest to protect our service against non-compliant or fraudulent activities. If you enable authentication logging for your Account or voluntarily participate in Proton's advanced security program, the record of your login IP addresses is kept for as long as the feature is enabled. This feature is off by default, and all the records are deleted upon deactivation of the feature. The legal basis of this processing is consent, and you are free to opt in or opt out of that processing at any time in the security panel of your Account. The authentication logs feature records login attempts to your Account and does not track product-specific activity, such as VPN activity.
See also section 3, "Network traffic that may go through third-parties."