How Formula Inbox diagnosed inbox placement failures and what it took to recover them.
Staffing and Recruiting Firm
A staffing and recruiting firm's Microsoft 365 mail went from 100% spam to 100% inbox in seven days after a false-positive phishing classification blocked new mail to established contacts. Overall inbox placement rose from 75% to 95%.
Read case studyB2B Professional Services Firm
A B2B professional services firm's outbound open rate recovered from under 10% to a sustained 48% after cold sending was moved off the primary domain. Google inbox placement went from 0% to near 100%, and overall placement rose from 23.1% to near 100%.
Read case studyUS Local Media Brand
A US local media brand relaunched a cold list of roughly 50,000 contacts on beehiiv and reached a 50.33% average open rate across 82,755 emails delivered. Spam complaints stayed at 0.001%, and Google inbox delivery was 100%.
Read case studyIndependent Book Publisher (Shopify + Klaviyo)
An independent book publisher on Shopify and Klaviyo recovered from a 30,000-profile list-bombing attack that had driven bounce rates to about 30%. Campaign bounce rates fell back under 1%, open rates reached 62% to 69%, and the engaged audience recovered from about 300 to 550 to 600 readers per send.
Read case studyUS Staffing Firm (Government Sector)
A US staffing firm serving government clients recovered after a DNS compromise that produced 28,000 fake pages and a Gmail 550-5.7.1 ban. Delivery error rate fell from 100% to 0% within days.
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