When standard deliverability fixes fail
If your emails are landing straight in the spam folder, the standard advice usually tells you to tighten your engaged segments. You will hear people say you should send only to 30-day openers until your sender reputation recovers. Here is the problem: when your open rate is sitting at 2.49%, that strategy falls apart completely.
You cannot segment your way out of an inbox placement disaster if nobody sees the email in the first place. When Gmail or Yahoo flags your domain as spam, your automated flows suffer just as much as your broadcast campaigns. That leaves your welcome series, browse abandonment, and post-purchase sequences effectively invisible to buyers.
We recently took on an ecommerce account in this exact position. The brand was suffering from severe deliverability penalties on Google accounts, with baseline flow open rates averaging under 2.5%. To fix it without waiting six months, we had to force positive engagement signals directly into the algorithms.
How automated seed lists repair sender reputation
To pull this domain out of the spam folder, we used an inbox warmup tool called Warmy to deploy seed lists. A seed list is an audience file comprising hundreds of controlled test inboxes hosted across major email service providers like Google, Yahoo, and Microsoft.
These are not real consumers, but automated accounts designed to simulate ideal subscriber behaviour. When you send an email to a seed list, the software monitors where that message lands across every inbox provider.
If the incoming email drops into the spam or junk folder, the software automatically pulls it out, places it in the primary folder, marks it as high priority, and registers a deliberate open and click. This sends immediate, positive behavioural signals back to Gmail's filtering engine.
The daily seed campaign setup
Our audit showed that the primary issue was isolated to Google accounts. We downloaded a dedicated seed list containing 500 Gmail inboxes and uploaded them directly into Klaviyo as a distinct segment.
Every single day, we sent a generic campaign broadcast exclusively to those 500 seed contacts. That is a deliberate tactic. By isolating the seed list from the main customer base, we generated 100% open rates and consistent click-throughs without skewing customer retention reporting.
Within the test inboxes, the software continuously rescued our daily messages from the spam folder and moved them into the primary tab. Each rescued message told Gmail that this sender produces wanted, priority content rather than junk.
The results after seven days
We tracked the recovery using automated flows rather than campaigns to get clean, unaltered metrics. Flows trigger continuously in the background based on real shopper actions, making them the most reliable indicator of true domain health.
Before implementing the seed list strategy, flow open rates for Gmail users sat at an abysmal 2.49% over a seven-day window. Exactly one week after deploying daily seed sends, Gmail flow open rates climbed to 18.79%. It worked faster than expected.
An open rate jump from 2.49% to nearly 19% in seven days represents thousands of recovered revenue opportunities from abandoned carts alone. The domain is not entirely out of the woods yet, but the primary placement hurdle has been cleared.
Scaling the warmup to other providers
While our first priority was fixing Gmail, mailbox providers require ongoing maintenance. If you want to accelerate the recovery speed further, you can scale the seed list volume from 500 contacts up to several thousand.
- Google Workspace: Useful for brands selling B2B or premium products where custom domains dominate.
- Microsoft Outlook and Hotmail: Essential for legacy consumer lists that filter aggressively on IP reputation.
- Yahoo and Verizon Media: Strict authentication filters that reward consistent volume and zero spam complaints.
We are currently expanding the warmup across secondary inbox providers while maintaining daily flow volume. Once your baseline sender reputation stabilises above 20% to 25% open rates, you can safely phase out the seed sends and return to standard audience segmentation.
Final Thoughts
Deliverability issues will choke your ecommerce growth faster than poor ad performance. If your open rates are below 5%, waiting for organic recovery through standard sends is a waste of time. Using automated seed lists forces positive engagement signals back into mailbox providers, giving you a proven path out of the spam folder in days rather than months.
Get your deliverability back on track
If your revenue has dropped and you suspect your emails are landing in the spam folder, we can pinpoint the exact cause. Book an In-box account audit and we will review your technical DNS records, inbox placement, and flow performance to fix your deliverability for good.
