Safari 27 Blocks Identity Resolution: What D2C Ads Must Do

When someone logs into a store or joins a newsletter in Safari now, their email address can stop at the browser. Apple's WebKit team published the details on October 19: Safari 27 blocks network access to companies that collect login emails and convert them into persistent ad tracking IDs. The block works at the network layer, Apple publishes no list of who is on it, and its tracking policy grants no exceptions.

This is the plumbing behind a lot of "people-based" advertising. Email-derived IDs are how a shopper on a publisher site gets recognized as the person who abandoned a cart last week, on a browser that already removed third-party cookies back in 2020. From Safari 27 onward, a blocked resolver never receives the email, so the ID is never created. Audience segments built on those IDs will keep reporting fine on other browsers while a chunk of high-intent Apple traffic drains out of them, and no dashboard will flag the day it happens.

Our read: the matched, known-person slice of paid media keeps shrinking, and retargeting stops covering for weak prospecting. The work shifts to creative that converts people the system knows nothing about. Hooks that qualify the viewer in the first two seconds, and enough variants to find each segment the hard way instead of buying a list of them. That demand curve, more creative doing more of the targeting's old job, is exactly what we are building IgniteAI for.

If you sell D2C: what share of your Meta and Google results still leans on warm retargeting pools, and have you tested what happens when that share shrinks?

Try our free ad tools: https://igniteai.in/tools/