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What are the email deliverability impacts of Apple's Sign-in with Apple private relay service?

Summary

Apple's Sign-in with Apple service, especially its private relay feature, has introduced a new dynamic to email deliverability. This feature allows users to sign up for services with a unique, randomly generated email address (@privaterelay.appleid.com) that forwards messages to their actual email address. While designed to enhance user privacy, this system presents unique challenges for email senders. The primary concern revolves around the sender's inability to directly know the user's real email address and, crucially, when a user decides to disable email forwarding for that private relay address. This lack of transparency can lead to hidden deliverability issues and impact list hygiene.

What email marketers say

Email marketers have expressed a mix of concern and pragmatism regarding Apple's private relay service. While acknowledging the privacy benefits for users, the primary worry centers on the potential for reduced visibility into subscriber engagement and the difficulty of maintaining a clean email list when bounces may not be reliably returned. Many marketers are actively seeking strategies to adapt to this new paradigm, emphasizing the need for robust internal processes to track user engagement and identify inactive addresses.

Marketer view

Marketer from Email Geeks asks if anyone has experienced deliverability issues with Apple's Sign-in with Apple. They are particularly concerned because users can technically remove themselves from receiving communication without the sender ever knowing, posing a unique challenge for email list management. This feature raises questions about how to maintain a clean and engaged subscriber base.

24 Oct 2019 - Email Geeks

Marketer view

Email marketer from Omeda states that Apple's Hide My Email feature impacts deliverability, necessitating adaptive marketing strategies. They suggest that while user privacy is enhanced, marketers must find new ways to measure engagement and ensure their emails still reach the intended inbox, moving away from reliance on traditional tracking methods.

15 Mar 2023 - Omeda

What the experts say

Email deliverability experts highlight that Apple's private relay addresses, while unique in their privacy-enhancing function, fundamentally behave like any other email alias from a purely technical standpoint. The key distinction, however, lies in Apple's handling of discarded emails, which can lead to a lack of bounce notifications. Experts stress the importance of understanding this specific behavior and implementing proactive testing and monitoring strategies to maintain a healthy sender reputation and ensure messages reach the inbox.

Expert view

Expert from Email Geeks advises that the app developer must log in with their Apple ID and register the domain used for sending to these private relay addresses. This step is critical for Apple to recognize and properly route emails through their privacy-focused system, ensuring delivery to the intended recipients.

24 Oct 2019 - Email Geeks

Expert view

Deliverability expert from Spamresource indicates that services like Apple Private Relay underscore the growing importance of strong authentication measures like DMARC for email deliverability. They highlight that verifying sender identity becomes even more critical when an intermediary service is involved, ensuring trust and reducing spam.

10 Mar 2024 - Spamresource

What the documentation says

Apple's official documentation and related technical resources clarify the purpose and operational requirements of the private email relay service. The primary emphasis is on user privacy and control, with mechanisms in place to allow users to manage their communication preferences. For senders, the documentation outlines specific steps, such as domain registration, that are necessary to ensure successful email delivery through these privacy-enhancing aliases.

Technical article

Apple Developer documentation explains that app developers need to log in with their Apple ID and register the domains that will be sending emails to these private relay addresses. This registration process is a foundational step, ensuring that only authorized senders can communicate with users through the privacy relay, maintaining the integrity of the service.

15 Oct 2019 - Apple Developer

Technical article

Maileroo documentation describes Apple's Private Relay email system as a privacy-enhancing feature that masks real email addresses for users. They elaborate that this system generates unique, disposable email addresses, providing an essential layer of anonymity and control for individuals when signing up for online services.

21 Feb 2025 - Maileroo Blog

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