macOS 27 Beta Reworks Mail's Compose Window Around Siri AI
Feature flags discovered by MacRumors forum member "mactracker" – who this week also revealed the hidden Siri "voice pad" interface in beta 4 – show the reworked bar in Mail's message composer, which now features "Write with Siri" in the most prominent position. When a suggested composition is selected, the formatting bar shows "Edit with Siri," "Proofread," and "Rewrite" options, as well as "How does this sound?" with the traditional formatting controls minimized. The new bar isn't switched on by default and remains hidden behind an internal feature flag, so most testers won't see it.
- ▪Feature flags discovered by MacRumors forum member "mactracker" – who this week also revealed the hidden Siri "voice pad" interface in beta 4 – show the reworked bar in Mail's message composer, which now features "Write with Siri" in the mo
- ▪When a suggested composition is selected, the formatting bar shows "Edit with Siri," "Proofread," and "Rewrite" options, as well as "How does this sound?" with the traditional formatting controls minimized.
- ▪The new bar isn't switched on by default and remains hidden behind an internal feature flag, so most testers won't see it.
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macOS 27 Beta Reworks Mail's Compose Window Around Siri AIFriday July 24, 2026 8:56 am PDT by Tim HardwickFor macOS 27 Golden Gate, coming this fall, Apple appears to be testing a new formatting bar for the Mail app's compose window that promotes Apple Intelligence's Writing Tools and Siri AI, based on findings in the latest beta. Feature flags discovered by MacRumors forum member "mactracker" – who this week also revealed the hidden Siri "voice pad" interface in beta 4 – show the reworked bar in Mail's message composer, which now features "Write with Siri" in the most prominent position.
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