Open rates from Apple Mail users are inflated and location data is masked, so senders must re-baseline metrics and stop using opens for automation triggers.
The metrics that matter#
- Authentication pass rate: share of mail passing SPF, DKIM, and DMARC alignment. Healthy: 99% or higher.
- Spam complaint rate: Gmail enforces at 0.3%; stay under 0.1%.
- Hard bounce rate: under 2%; above 5% triggers platform reviews.
- Inbox placement: above 90% across major providers via seed tests.
- Engagement: click and reply rates by segment; opens are unreliable after Mail Privacy Protection.
Where to read them#
- Google Postmaster Tools for Gmail domain reputation, spam rate, and authentication.
- Microsoft SNDS and JMRP for Outlook.com IP reputation and complaints.
- Your ESP's delivery and bounce reports.
- DMARC aggregate reports for authentication by source.
Improving the numbers#
- Identify the share of your list using Apple Mail.
- Shift primary metrics to clicks, replies, and conversions.
- Remove open-based triggers from automations and sunset policies.
- Report open rates with an MPP caveat or exclude Apple opens.
Frequently asked questions#
Does Mail Privacy Protection affect deliverability?
Not directly. It affects measurement. Deliverability signals at Apple are based on complaints and authentication.