What does Gmail’s “important” tagging indicate about sender trust?

Gmail's Important marker indicates high predicted relevance:

The algorithm considers engagement history with the sender. Frequent opens, clicks, and replies increase importance probability.

Sender patterns matter: emails from contacts you reply to get importance signals.

Content matching past important messages also factors in.

For senders: Receiving Important markers suggests strong trust and engagement signals. It correlates with reliable inbox placement.

You cannot directly control Important tagging, but building genuine engagement increases the likelihood.

The Important flag is the harbor's VIP designation. It comes from consistently delivering valued cargo.