If you run cold email for a living — agency, SDR team, recruiter — you've seen this dashboard: a big green number. 95%, 98%, 99%. Health score. Deliverability score. Whatever the tool calls it.
Here's the problem nobody selling you that tool wants to say out loud: that number measures warmup activity, not inbox placement.
What the health score actually measures
Warmup tools work by joining your account to a shared pool of other users' accounts. These accounts email each other, open, reply, and mark things "not spam" — automatically, all day. Your health score tracks how well that internal loop is going.
It does not tell you where your actual campaign emails land when they hit a real prospect's Gmail or Outlook inbox.
The gap, in plain terms
A clean health score inside a warmup dashboard is not the same as confirmed inbox placement.
Google and Microsoft have both gotten sharply better at detecting automated warmup patterns (Gmail's November 2025 update, Microsoft's May 2025 tightening). Warmup pools are shared — hundreds or thousands of accounts, some of them warming domains that send genuinely spammy campaigns. Your reputation rides on the same pool.
So the score goes up. Your real placement can still be going down. Nobody tells you until a client asks why replies stopped.
Why this hits Indian agencies harder
Most Indian cold-email agencies run lean — one or two people managing outreach for 5-10 clients. There's no time to run a separate inbox-placement test before every campaign. You trust the dashboard because that's what you're paying for.
That trust is exactly the gap. The dashboard is built to show you the number that keeps you subscribed, not the number that tells you the truth.
What actually tells you the truth
Three things, none of which are "a health score":
- Your own DNS setup — SPF, DKIM, DMARC configured correctly for the domain you're actually sending from. Fixable, verifiable, yours to control. No pool involved.
- Real seed-inbox placement — a small set of inboxes you own, checked directly (Inbox vs Spam), not a synthetic activity score.
- Ongoing reputation monitoring — is this domain drifting toward spam over time, based on real signals (bounce rate, complaint rate), not internal pool activity.
That's diagnose, repair, monitor. Warmup helps ramp a domain — but it's a supporting step, not the thing that tells you whether your emails land.
The honest move
Before your next campaign, run a real audit on the domain you're about to send from — not the warmup pool's opinion of itself. Check the DNS is actually correct. Check where a real test email lands. Then send.