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Use (which includes everyone in the original email) carefully, usually for:

When a group email asks for a headcount or confirmation from all recipients. The Dangers of Misusing "Reply All" Reply ↓

"Reply All" can lead to groupthink or public embarrassment, such as when sending a "thank you" to dozens of people unnecessarily. Use (which includes everyone in the original email)

A simple "Thank you" or "Received" that doesn't need to be seen by everyone. When to Use "Reply All" Reply ↓