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A growing ecommerce brand came to us with a common challenge. They wanted to grow their email list without hurting deliverability or losing revenue.
They were using double opt-in through Klaviyo forms, which helped keep their list clean, but it introduced a new friction point:
They needed a way to maintain list quality without adding checkout friction.
That's where Mail Ward came in.
Before Mail Ward, the team tried manual list cleaning and bulk validation tools, but those became a workflow bottleneck:
Hours spent exporting/importing files
Hard bounces still slipping through
Delayed cleanup meant damage had already been done
Inconsistent inbox placement and poor deliverability
Their Klaviyo Deliverability Score was sitting around 52, so campaigns missed inboxes and hit spam filters at scale, costing them revenue on every send.
They knew something had to change.
The brand integrated Mail Ward using webhooks and real-time filtering, which let them switch from double opt-in to single opt-in without hurting deliverability.
Mail Ward became the frontline filter:
Validated each signup in real time
Blocked spam bots and undeliverable profiles instantly
Prevented risky emails from ever entering Klaviyo
Automated suppression, with no more manual cleanup
This single change removed friction for customers without sacrificing list quality.
And the results were immediate.
Klaviyo Deliverability Score rose from 52 to a consistent high 90s
Emails now land in inboxes, not spam folders
Revenue improved from better inbox visibility and fewer lost offers
No manual cleaning required. Mail Ward handles it automatically
Customer now scales email confidently with single opt-in enabled
"The customer now describes Mail Ward as 'a safety net for Klaviyo. We barely touch it, yet we feel the impact daily.'"
The team also went one step further.
Using Mail Ward events inside Klaviyo, they created segments such as:
This let them send smarter, not larger, focusing deliverability on the profiles most likely to open, click, and convert.
The Deliverability Chain:
Mail Ward's webhook infrastructure is built for speed, accuracy, and reliability:
Fast webhook responses keep your signup flow free of delay
High accuracy in email validation and risk assessment
Continuous monitoring and protection around the clock, every day of the year
Mail Ward's real-time filtering solves the deliverability problem before it exists.
Unlike bulk cleaners that fix lists after damage is done, Mail Ward:
Prevents bad emails from ever entering your system
Real-time validation at the point of signup
Stops bounces, spam traps, and bots at the door
Instant blocking of risky profiles
Protects sender reputation long-term
Proactive protection maintains ISP trust
Improves inbox placement faster than any reactive method
Prevention beats correction
Requires zero ongoing effort once connected
Set it and forget it, with fully automated protection
It's the fastest path to better deliverability, and one of the few options with both immediate and compounding benefits.
| Before Mail Ward | After Mail Ward |
| Double opt-in friction | Smooth single opt-in flow |
| Bounce and spam risk | Bad profiles blocked automatically |
| Manual list cleaning | Fully automated hygiene |
| Deliverability score ~52 | Consistent high-90s |
| Revenue leakage | Strong ROI through inbox placement |
Mail Ward made this brand's email marketing more profitable and easier to scale, and they've been with us for over a year as proof.