Warmth
Per-inbox deliverability signals. No external warmup network — these are the real proxies for inbox reputation (bounces, replies, unsubscribes, DNS). Google's own per-domain reputation lives in Postmaster Tools — verify each domain once.
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Sanity check via mail-tester.com
- Open mail-tester.com in a new tab — they generate a unique recipient address.
- From the inbox you want to check, send any real-looking email (subject, body, signature) to that address.
- Refresh the mail-tester page — you get a 0–10 deliverability score with concrete fixes for anything below 9.
- Repeat per inbox / per template. Cheap and brutally honest.