The Deliverability Collapse Nobody Sees Coming

An account we audited this week opened campaigns at 38 percent a year ago. The most recent relaunch opened at 8.

Nobody changed the copy. Nobody changed the design. What changed was the sending: less frequent, less consistent, aimed at the wrong segments. The creative was the same. The strategy behind it wasn't.

That's the version of a deliverability collapse the dashboards don't catch until the bleeding is already showing up in revenue. By the time you notice the open rate, Gmail has already made its decision about you, and the next campaign you send is getting filtered before it lands.

Gmail isn't asking whether your next send is good. It's asking how aggressively to bury it.

How collapse compounds

Opens drop. Bounces climb because inbox providers are routing more aggressively. Complaints follow because the people still seeing your emails are the least engaged. Throttling kicks in once the complaints cross threshold.

Each stage makes the next stage worse. Recovery has to run that same order in reverse — you can't fix throttling without fixing complaints, you can't fix complaints without fixing bounces, and you can't fix bounces without rebuilding the engagement signal that tells Gmail you're worth delivering to.

Here's the thing most people miss when they try to rehab a sender: they're staring at open rates trying to guess what Gmail thinks of them, when Google literally tells you. It's called Google Postmaster Tools, and it's free.

Postmaster gives you a domain reputation rating — Low, Medium, High, or Bad. That's the diagnostic. Not your open rate. Not your last campaign report.

The reputation reading is what Gmail uses to decide where your next email lands, and they're showing it to you directly. Updates don't land on a fixed schedule — sometimes daily, often closer to weekly — so during rehab you check often to catch the rating move when it happens.

Welcome flow open rate is still a useful secondary signal because new subscribers are your most engaged segment. But Postmaster is primary.

The 3-Stage Sender Recovery

Gmail's reputation rating — not the calendar — decides when you widen.

Stage 1: Repair reputation

Constrain every campaign send to people who engaged in the last 14 to 30 days. Nobody older. The point is to send exclusively to people Gmail already trusts you to land with, so the engagement signal climbs back up.

You stay here until Postmaster reads High. Could be two weeks, could be six. The calendar doesn't decide when you're recovered. Gmail does.

Stage 2: Slow expansion

One step per week, watching Postmaster the whole way. If the rating drops, you stop widening and hold until it recovers.

Stage 3: Steady state

Every account is different. Those are my defaults, not laws — but the principle is consistent across every rehab I've run.

Where most brands lose months

The mistake I see most often is skipping Stage 1, or running Stage 2 on the calendar instead of on the Postmaster reading. A brand will widen to 60-day engagement in week two because the playbook said so, even though their domain reputation is still sitting at Medium. That's how the rehab fails and the cycle restarts.

Stage 1 is non-negotiable. The gate from Stage 1 to Stage 2 is what Gmail is telling you in Postmaster — not how many weeks you've been doing it — and discipline at this step is the entire rehab.

If your open rates have been sliding and you don't know why, the answer is probably waiting for you in Postmaster right now.

If you want me to look at your domain reputation and tell you which stage you're in, grab a slot below.

Now go check your Google Postmaster Tools.

– Raymond