Gmail deliverability audit

Eight checks for when authentication passes and Gmail still flags you.

The question

“When Gmail flags your email and every authentication check passes, what is it reacting to?”

The assignment

Pull 30 days of Gmail spam rate from Postmaster Tools next to your daily send volume. Then find the Feedback-ID header in a recent campaign and count last month's campaign recipients by mailbox provider.

The whole write-up →

Open Postmaster Tools and your send log side by side. The eight checks below go from the spam-rate days to the authentication records, in that order, because when authentication passes the answer is in who you mail and how often.

01Days over 0.1% spam rate in the last 30
Postmaster Tools, daily spam rate.
02For a high day with no campaign: what went out one or two days earlier
03Does your Feedback-ID header carry a campaign identifier?
Gmail, a recent campaign, Show original.
04Does your platform show zero Gmail complaints on every send?
05How does your engaged segment define engaged?
06Mailbox providers at zero recipients last month
07Low-intent Gmail automations paused while the rate is high?
08DKIM on your own domain, SPF aligned through a custom Return-Path, one DMARC record?

What your numbers say

1 of 8 checks done. 0 days over 0.1%: you are near the line, so the fixes below keep you under it.

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