Case Study · Lead Generation Agency
How a 4-Person Agency Stopped Flying Blind on Client Deliverability
Managing outbound for multiple clients means one deliverability problem can damage relationships you spent months building. Here's how one agency got full visibility, and turned it into a selling point.
The Situation
A 4-person lead generation agency was running cold email campaigns for 6 B2B clients simultaneously. Each client had their own domains, mailboxes, and sequences. The agency was doing everything right on paper: warming up domains, keeping send volume conservative, personalizing copy.
But things kept going wrong in ways they couldn't explain.
A campaign would slow down without warning. A client would report their emails landing in spam. Bounce rates would tick up on one account while others looked fine. The agency's response was always reactive: something breaks, you investigate, you fix it, you explain to the client why it happened.
The explanation was always vague "deliverability issue," "temporary throttling," "we're monitoring it." Clients accepted it, but it eroded trust every time.
The deeper problem wasn't the deliverability issues themselves. It was that the agency had no early warning system and no way to show clients what was happening in real time.
What They Needed
- A single place to see the health of every client campaign without toggling between accounts
- Automatic detection of velocity spikes, bounce threshold breaches, and throttling, before they became client problems
- Something to show clients instead of vague status updates
- A way to pause at-risk campaigns without killing the ones that were performing
How SendState Changed the Workflow
Multi-workspace isolation
Each client lives in a fully isolated workspace. Deliverability events in one account don't affect others, and the agency can monitor all six from a single control panel.
Real-time health scoring
Every mailbox gets a continuous health score based on bounce rate, reply rate, send velocity, and warmup status. When a score drops below threshold, the system flags it before it becomes a blacklisting event. The agency's average health score across client campaigns stabilised at 82/100 within the first month.
Automatic protection triggers
When bounce rate crosses the threshold or velocity spikes unexpectedly, SendState pauses the affected mailbox automatically and logs the reason in the campaign timeline. The agency sees exactly what happened, when, and why, without having to dig through logs.
Research-backed personalisation per client
Before campaigns launch, SendState's research agent scans each prospect's website, job listings, and company signals to build a contact-level brief. This reduced the volume of low-quality emails hitting inboxes, which directly improved engagement rates and reduced spam triggers.
White-label PDF reports
The campaign timeline and health data that used to live inside the tool now gets exported as a branded PDF report delivered to each client weekly. Clients can see reply rates, health scores, deliverability events, and advisor actions, all under the agency's branding.
The Results
In the three months after switching to SendState:
- Zero blacklistings across all six client accounts
- Deliverability health score averaged 82/100 across all mailboxes
- When throttling events did occur, the agency had a logged explanation within minutes, not hours
- Client reporting went from a weekly manual writeup to a one-click PDF export
- Two clients extended their retainer citing "transparency" as the reason
Why It Worked
Most deliverability problems aren't caused by one thing. They're caused by a slow accumulation of small issues: slightly too much volume here, a marginal bounce rate there, a domain that wasn't quite warm enough. By the time something breaks visibly, the damage is already done.
SendState's protection engine catches the accumulation before it compounds. And because every action is logged in the timeline, the agency always has an answer when a client asks what happened, not a guess, a fact.
"Before SendState, deliverability was the part of the job we dreaded explaining to clients. Now it's the part we lead with."
Agency founder, B2B lead generation