The usual failure
Unsubscribe is the only suppression. Buyers get abandon mail. People in a sales conversation get a blast about a different offer.
What to make true
Layered: bought, in-conversation, recently mailed, complained, sunset. Who must not get this message is part of the spec.
Worked example
Keep it this plain. A team uses suppression as if buying the software installed the meaning. It did not. Unsubscribe is the only suppression. Buyers get abandon mail. People in a sales conversation get a blast about a different offer. The move is not a new integration. Layered: bought, in-conversation, recently mailed, complained, sunset. Who must not get this message is part of the spec.