Private Relay is a feature of iCloud+ subscription that helps protect your privacy when you browse the web in Safari. It works by sending your requests through two separate, secure internet relays. Your IP address is visible to your network provider and to the first relay, which is operated by Apple. Your DNS records are encrypted, so neither party can see the address of the website you’re trying to visit. The second relay, which is operated by a third-party content provider, generates a temporary IP address, decrypts the name of the website you requested, and connects you to the site.

Regarding the private email relay service, it is a service that sends email to a recipient using an automatically generated email address to preserve privacy. Any messages sent to this address by the app or website developer are automatically forwarded to your personal email address by Apples private email relay service. You dont need to log in to check your inbox mail of private relay Apple ID. Any email sent to your private address will be automatically forwarded to your regular email address.