Here comes a brand new Gmail labs feature – Smart Mute & Unmute. Gmail already has the mute feature in place, but this one makes it smarter by quieting unwanted email threads that aren’t actually spam.
If you enable “Smart Mute” from the Labs tab in Gmail Settings, muted conversations will only appear in your inbox if a new message in the conversation is addressed to you and no one else, or a new email in the conversation adds you to “To” or “Cc” line. Once you enable Smart Mute, mute behavior will change across all versions of Gmail: web, mobile, Android, etc.
Even unmuting the conversations have become easier. There are two ways to unmute now. The first is through an “Unmute” option in the “More actions” menu. You’ll see this when you view or select a muted conversation.
When you’re viewing a muted conversation, you’ll see the second new way to unmute: the “Muted” label next to the subject line now behaves just like all other labels. Clicking on the “X” will remove the Muted label and unmute the conversation.