CASE STUDY · EMAIL DELIVERABILITY, DEMAND GENERATION
From Invisible to Inevitable: How Inbox Monster Cut CPL by 58% and Built a Pipeline That Sales Wants
Inbox Monster’s product worked; their demand engine did not. Somebody Digital rebuilt the conversion infrastructure and paid strategy from the ground up — and turned volatile, unqualified activity into a pipeline the sales team actually wants.
Cost per lead
Across the engagement, still trending down
Conversion rate
After the landing-page rebuild
Search impression share
In six months
Lead volume
In the same period, at 35% cheaper clicks
THE SITUATION
A product that worked — and a demand engine that did not.
Inbox Monster had a product that worked very well. Their platform helped email marketers diagnose deliverability failures, test inbox placement, and fix the invisible problems costing brands real revenue. The category was growing, and the demand was there. But their digital presence told a different story.
When paid ads ran, they were visible. The moment campaigns paused, they disappeared. Competitors stepped in and owned the search results page entirely. There was no organic floor, no brand presence to fall back on — the whole operation was one budget decision away from going dark.
The leads that were coming through were not helping either. The funnel routed paid traffic straight to a Calendly booking link with no qualification and no filter, so the sales team was calling contacts who had never read a product page. Cost per lead swung widely month to month, with no reliable number to plan against — and no attribution story leadership could take into a board conversation.
No organic floor
On when paid, off when paused
A funnel with no filter
Straight to Calendly
A misread differentiator
Filed under one thing
WHAT WE DID
Not run harder — build something worth running.
Fix the foundation first
New landing pages were built for deliverability and rendering, designed to convert rather than just exist. The conversion goal was restructured: Calendly bookings were demoted from primary CTA to secondary option, with form fills taking the lead. Micro-conversions — clicks on "book a demo," scroll depth, engagement signals — were wired into the tracking stack so there was something meaningful to optimise toward before a lead ever qualified.
Rebuild the paid strategy from the ground up
Brand, high-intent non-brand, and competitive terms were separated into distinct campaign layers, each with its own bidding logic, targeting and creative brief. Target Impression Share protected brand visibility. Target CPA and Max CPC governed the high-intent terms where purchase intent was real. Competitor campaigns were built to intercept searchers actively evaluating ZeroBounce, Validity and others.
Layer in LinkedIn
LinkedIn was layered in to do the work Google could not. Thought-leadership ads ran from personal profiles to shift the brand from "tool vendor" to "category expert." Video content was introduced for product launches and feature announcements. An ABM content framework organised messaging around four themes: USP differentiation, competitor positioning, product updates and platform integrations.
Keep competitor intelligence running
Throughout the engagement, competitor intelligence ran continuously — tracking how rivals were bidding, where they were gaining ground, and where Inbox Monster could move into the gap.
THE RESULTS
The traffic did not change — the infrastructure finally matched it.
CONVERSION AND EFFICIENCY
Converting more, for less
COST PER LEAD
Still trending down
and still trending down into early 2026.
SEARCH IMPRESSION SHARE
Up 40% in six months
in six months.
QUALITY, NOT JUST VOLUME
Best month on record
THE TAKEAWAY
Not a spend problem — an infrastructure problem.
FROM INVISIBLE WHEN PAUSED
To a foundation worth running
FROM A FUNNEL WITH NO FILTER
To qualified demand
FROM A MISREAD TOOL