Work top-down — one of these is usually the answer.
- Kill switch — Settings → Reminder defaults → Stop all automated sending. If halted, resume as Admin with a reason.
- First-run review — new accounts hold everything until you have reviewed the first list once.
- Manual mode — if chasing mode is Manual approval, each invoice needs Start chasing.
- Quiet hours / contact days / timezone — due work waits for the next allowed window in your Localisation timezone.
- Approvals — Firm/Final (and threat-list wording) sit in Activity until a human approves.
- Minimum chase amount — balances under the floor never enrol.
- Per-debtor / per-account caps — held messages show a reason in Activity rather than vanishing.
- Never-chase / dispute / promise / reply pause — open the debtor or invoice; chasing may be correctly stopped.
- Plan balance cap — if you hit the overdue balance ceiling, new enrolments wait; finish in-flight work or upgrade / adjust balance.
Activity's sent log tells you whether anything left recently. If messages show as failed to send, check Email sending and Support under deliverability.