Every failure downstream traces back to who was on the list. The copy cannot fix the wrong reader, and volume cannot either.
The profile comes first: the industry, the size, the role, and the specific problem the offer solves for that role. Then the sourcing. Then the verification, before anything is written to, because a bounce costs reputation that took three weeks to build.
A list that has to be defended line by line is the right size.
How we do it
The profile and the acceptance criteria are agreed in writing before the first send, and they stay yours. Every address is verified before it is written to.