Big launches fail on bounce rate more often than on copy. Run this before any list-wide send.
Checklist
- Validate the full list (syntax, disposable, role, typo, live MX)
- Remove invalids in one click
- Suppress dormant-with-zero-opens for 6+ months
- Confirm resolution coverage on the core segment only — you do not need every address named to ship
Run this on your own list.