You can change the prospect's status to Unsubscribed or Do not Contact by heading over to Prospects > Search or Filter(if needed) > Select All or just the required prospects > More > Change Prospect Status > Unsubscribed/Do not Contact > Change

N.B. Once you change the prospect status to Unsubscribed, you will never be able to send emails to that prospect from Klenty again. Whereas, the prospect status "Do not Contact" can be reverted.

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