Proton Mail: Encrypted Email

"Within the limits of applicable law, the Company reserves the right to review and change this Privacy Policy at any time. As long as you are using the Services, you are responsible for regularly reviewing this Privacy Policy. Continued use of the Services after such changes are performed shall constitute your consent to it."

Proton can modify its privacy policy at any time without providing direct notice to users, and continued use is treated as consent to the new terms.

"We rely on Chargebee to process payments. Strictly necessary information is shared with Chargebee for credit card, PayPal, Stripe and Bitcoin transactions in order for the payment to be successful and associated with your account. If you use Proton's live chat support, you consent to having the data contained within your live chat interaction processed by Zendesk Inc, the provider of Proton's live chat support platform."

Payment information is shared with multiple third-party processors (Chargebee, Stripe, PayPal), and customer support interactions are processed by Zendesk in the United States.

"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 period of temporary data retention is determined by our legitimate interests of protecting the service from spam, and also by any applicable Swiss legal requirements we must comply with."

Proton retains IP addresses permanently for users it deems in violation of its Terms of Service, and temporary retention periods for verification data are vaguely defined with no specific deletion timeline.