Trusted sender
Reputation. An email sender who only sends email messages to those recipients that granted explicit permission to that sender.
Trusted senders always strive to send the right message, to the right person, at the right time, with the right frequency.
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Trusted sender, not white hat sender
You might encounter the term white hat sender. The term trusted sender replaces that term and eliminates any potential racial or cultural connotations associated with the earlier term.