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Apple Private Relay Configuration
Apple maintains a special subscriber email domain called privaterelay.appleid.com for their Private Email Relay Service. Senders use this domain to communicate with users who opted to use an anonymous email address with Apple’s “Sign in with Apple” functionality.
Before you send to this domain, you must properly register your sending domains with Apple. If you don’t register with Apple, all mail delivery attempts to the privaterelay.appleid.com domain is rejected.
Requirements
Apple requires that email messages authenticate with Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM). This requirement means that you must have Sender Authentication Package (SAP) or a private domain in place. You must also send using a from address at the SAP or private domain. If your SAP or private domain is email.domain.com, you must send using a From Name of (something)@email.domain.com.
The bounce or return path domain must be registered with Apple. If your SAP domain is email.domain.com, then the bounce domain or return path domain is bounce.email.domain.com. In other words, it’s the word bounce followed by a period followed by the SAP domain. If you don’t correctly register this domain with Apple, all email delivery attempts are rejected.
How to Register
After you register the domain with Apple, email delivery attempts to the privaterelay.appleid.com domain are no longer rejected. Keep in mind that individual users can revoke access to their individual inboxes at any time. If a subscriber does revoke access to a sender, any future attempts to send email to that address can result in bounced messages. Some bounces can still occur. One hundred percent email delivery (or even inbox delivery) isn’t guaranteed.
