For Klaviyo senders

Your spam rate just spiked.
Klaviyo shows nothing.

Filtered mail still counts as delivered. You are losing email revenue while the dashboard says fine.

Names the send. Warns before the next one. Answers in your AI.

Name the send that did it

$169 once · no subscriptiontwo read-only connections

sorrel.co

One flow carries 78% of what Google attributed.

Gmail feedback loop · 52 days · 26 rated days · data through Sep 18

FlowAbandoned CartIdentified21 of 26 daysworst 1.74% · Sep 1

Your cart expires tonightEmail 211 of 21 daysworst 1.74%

Still thinking it over?Email 17 of 21 daysworst 0.92%

Last chance: your cartEmail 33 of 21 daysworst 0.61%

FlowWelcome Series4 of 11 daysworst 0.97%

CampaignSep 14 - Last chance | 40% off1 of 1 dayworst 1.61%

3 of 110 sends · 88.4% of the window

Your AI reads your Postmaster now.

The Klaviyo emails to check. Clear next steps. Less digging.

Gmail deliverability

Which Klaviyo email should I check first for bramble.co’s Gmail spam spike?

Matching ngxqAi in KlaviyoSpamSpike

Read as spike (brand bramble.co, date 2026-08-27).

Reading details · demo workspace

Feedback-ID from Google: ngxqAi
Resolved in Klaviyo: Back in stock | EN
Klaviyo flow ID: PZnGAF
Attributed rate: 0.24%

The Aug 26 to 27 window is closed. A named send is evidence to investigate, not a count of complaints.

Example answer from this reading

Google’s Feedback-ID ngxqAi matches this individual Klaviyo flow email.

0.24% attributed spam rate for this ID on Aug 27 (Postmaster).

Start with Back in stock | EN.

Google’s Feedback-ID ngxqAi matches this individual Klaviyo flow email.

0.24% attributed spam rate for this ID on Aug 27 (Postmaster).

The evidence behind your next sending decision.

Find the send.Google’s spam signals matched to Klaviyo campaigns and flow emails.
Know what to do next.Prioritized actions for your next send, with the evidence behind them.
See every brand.Your brands ranked by what needs attention.
Connect once.Included in your license. Read-only. Revoke anytime.

Get your license

How to connect it

Google already knows which send did it. Klaviyo was never told.

SpamSpike reads Google’s own id and names the send.

postmasterspam rate 0.47% · Sep 9 · bramble.co

klaviyocomplaint rate 0.01% · same day

joinFeedback-Loop IDs matched → 2 candidate sends

identifiedCampaign "Closing tonight" · exact FBL match

likelyFlow Abandoned checkout | EN · timing and audience overlap

actionshold the next campaign · trim the flow to recent openers · fewer urgency-worded sends

A worked example, not a customer. Every conclusion carries its evidence and an honest confidence label.

Klaviyo’s Gmail complaint rate is not low. It is zero, by design.

Gmail reports no individual complaint to any ESP. The 0.01% you check is every other provider.

0.47%Google Postmaster · Gmail, user-reported

0.01%Klaviyo · every provider except Gmail

You have the red chart, not the send.

This is the investigation, not another score.

The Google tab’s verdict card: 13 of 30 days above Google’s 0.10% line, the spam-rate curve, and the sender requirement checks. Demo workspace.

The flow is still sending tonight.

The spike gets found and fixed. The flow over Google’s line for five months gets neither.

weeklyThe flow nobody re-checks. A campaign gets reviewed the day it ships. A flow runs for two years unread. Every one ranked against your account’s own rate, every week.
alertsGoogle published a spike this morning. The next send is still scheduled. Slack or email within six hours of Google publishing a spike, naming the campaign or flow. Never a daily ping.
portfolioEvery brand, one screen, worst first. Postmaster shows one domain at a time. Here every brand is a ranked row with its 30, 60 or 90-day curve, and the one that needs you sits at the top.

What we won't pretend.

postmasterAggregated and delayed. Daily domain-level signals, about two days behind. We work with what Google publishes.
recipientsNo identities. SpamSpike cannot tell you which Gmail user complained. Nobody can.
evidenceThin stays labelled thin. When the data can't name the send, your report says Possible and shows exactly why.

Who built this, and why

Hey I’m Denas. I’ve been in email since 2014, which is long enough to have heard “email is dead” about six times and to have watched it out-earn every other channel each time.

These days I run email across 10+ brands, DTC and digital apps, doing $75m+ a year combined. Lifecycle, LTV, and the tests that move a number instead of filling a slide.

I’m an email geek, specifically the deliverability kind, which is the least glamorous seat at the table. Everyone obsesses over creative. So do I. But the best email anyone ever wrote converts at zero if Gmail quietly files it under spam.

Which is how this got built. Every week: export Postmaster, export Klaviyo, line the dates up in a spreadsheet, squint, guess. Then again for the next brand. I got tired of guessing.

If something here is wrong, tell me. I’ll fix it, or say so publicly.

12 years in email · LinkedIn · X

Pay once, own SpamSpike forever.

The send behind your Gmail spam spike, named. One licence, up to 10 Klaviyo accounts, no subscription.

See it name one on the demo

$169

One-time payment

✓the send that did it, from Google’s own id
✓ask it in Claude, ChatGPT or Gemini, on your data
✓the flow Google named on 54 of the last 63 days
✓the “soft bounces” that were refusals, and who they blame
✓the provider going bad while you watched Gmail
✓the audience doing it, and the segment that replaces it
✓every brand rechecked every six hours, Slack or email on a spike
✓proof the fix worked, measured from the day you fixed it
✓every 1.x update free, at the price you pay today
✕no more manual exports to map Klaviyo to Postmaster
✕no subscription, nothing to cancel

$16998 left

$299next 200 · #101+

$399standard · #301+

Needs about 5,000 Gmail-bound messages a day. Under Google’s volume gate Postmaster goes quiet, and this cannot work.

Agency running more than 10 Klaviyo accounts? Message me on LinkedIn or X and we’ll sort out a deal :)

Stop guessing which send did it.