Apple today provided developers with the second beta of an upcoming macOS Sequoia 15.4 update for testing purposes. The new beta is available two weeks after Apple released the first beta.
Registered developers can opt-in to the macOS Sequoia beta through the Software Update section of the System Settings app. An Apple ID associated with an Apple Developer account is required to get the beta.
macOS Sequoia 15.4 brings Mail Categorization to the Mac for the first time, reorganizing the Mail app into dedicated categories like transactions, updates, promotions, and primary, a category that surfaces the most important emails first.
Read more at MacRumors.com