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Android users can declutter their inboxes with Gmail's new 'Manage Subscriptions' tab
Take back control of your inbox with Gmail's powerful new subscription management tool.
The feature tends to sort subscriptions by most frequent senders, making it easier to identify and act on overwhelming email volumes. As mentioned, it is currently available for Gmail for web and can be accessed by navigating to Inbox on the top left corner and finding the new "Manage subscriptions." There are several third-party clients that also do a good job in helping users to unsubscribe from unwanted mails and subscriptions, but having it built in native Gmail is a welcome move for many from Google.
Or read this on Android Central