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What are positive engagement signals for email? (e.g., opens, clicks, replies)

Positive signals include opens, clicks, replies, forwards, saving messages, starring messages, and moving them from spam to inbox. The strongest positive signal is when a user explicitly marks a message as This is not spam which tells the provider the filter made a mistake and that the sender is trusted.

These actions tell mailbox providers that recipients find your messages valuable.

They are the warm lantern signals along the shoreline guiding your vessel into safe waters.