B2B Professional Services Firm · B2B Professional Services
A B2B Professional Services Firm's Outbound Open Rate Went From Under 10% to a Sustained 48%, Held for Five Months
Client Snapshot
A founder-led B2B professional services firm whose new business runs on cold outbound. The team is small, and every new client relationship starts with an email to a prospect who has never heard of them. They came to us when that engine stopped working. Emails were going out in volume and almost nothing was landing.
The Situation
The problem showed up first in a number no one wanted to see. Google Postmaster rated the primary sending domain "bad," the lowest reputation tier it reports. Our placement test confirmed why that mattered: across all providers, only 23.1% of test messages reached the inbox, and 70.5% went straight to spam. At Google Workspace specifically, where most of their buyer contacts sit, inbox placement was 0%. Google's spam filter was catching everything.
The engagement data matched. Average open rates had fallen to 6.1%, below the roughly 10% floor that usually signals bot activity rather than real readers. The Yahoo-reported spam complaint rate was 3.8%, against a mailbox-provider guideline of under 0.1% and an enforcement threshold of 0.3%. Bounce rates spiked as high as 5.28% because contacts were being uploaded without verification.
The root cause was structural. Cold outbound, marketing, and everyday business email were all sending from the one primary domain. Negative engagement from cold sending was dragging down the reputation of the domain the company also relied on to reach existing clients and partners. DMARC sat at p=none, so nothing enforced authentication, and DMARC reports arrived as an unreadable flood of individual messages. One signal pointed the right way. When mail did land, click-through was 5.62%, well above the 2 to 3% typical for B2B. Buyers wanted what the company was selling. They just weren't seeing it.
What We Did
The decision that drove everything was segmentation. We stopped all cold and bulk sending from the primary domain immediately, so its reputation could recover, while keeping genuine client and internal mail flowing to rebuild positive signal on it. Cold outbound moved onto six separate domains the client already owned, five mailboxes each, warmed over four to six weeks and rotated monthly so no single domain ever absorbed continuous cold volume. We moved DMARC onto a path toward enforcement and replaced the report flood with aggregated reporting we could actually read. We built a verification and sourcing process so unverified addresses stopped driving bounces, and we replaced default platform tracking links with branded ones that don't trip filters. The founder's brief set the tone for the whole build. Do it once, do it properly, then keep it maintained.
The Results
Measured from the rebuilt outbound program, May through September 2026:
- Open rates recovered from 9.7% the week before we paused sending to a sustained average of roughly 48%, holding in the mid-40s to mid-50s for five straight months. Recent weeks have run above 55%. That is close to a fivefold improvement.
- Weekly placement tests now show the outbound sending addresses at or near 100% inbox placement for both Google and Microsoft 365, up from 0% at Google in the original audit.
- Reply rate, the metric that turns into live buyer conversations, climbed from about 0.2% at the low point to a June peak of 6% and a sustained level above 2%.
- The primary domain came out of Google's spam filter, authentication held stable across HubSpot and Outlook, and the domain stayed clear of blacklists throughout.
Our emails seem to be delivering really well in Apollo. I'm getting a lot more responses, and I'm not getting any more of the kickbacks.