We publish a substitute list only where a record says what kind of product it is. mail-tester.com's does not yet, so this page names none. The Email category lists every offer we track alongside it.
Current mail-tester.com Situation
Risk Level:source unconfirmed
Why: The page we cite for mail-tester.com states no amount, tier or rate we can read when we last looked, on 2026-10-12. We are not publishing a stability judgement for it until that is fixed.