Client Reviews & Case Studies
See how leading email marketing agencies, SDR teams, and outbound founders achieve 98.7% deliverability with WarmedInboxes.
"We manage cold email for 24 B2B SaaS clients. Before WarmedInboxes, our SDRs spent half their week creating Google Workspace inboxes and waiting 2 weeks for warmup. Now we spin up 50 mailboxes in 5 minutes with perfect SPF and DKIM. Open rates jumped from 28% to 54%."
Marcus Vance
Founder & CEO • ScaleOutbound Media (Austin, TX)
"The dedicated UK server cluster makes a massive difference when targeting European and British enterprise directors. Our spam complaints dropped to zero and we have not seen a single domain ban in 8 months. Best $4/box investment in outbound."
Eleanor Wright
Head of Growth • Apex Pipeline Agency (London, UK)
"The 1-click CSV export directly into Smartlead saved us hundreds of manual setup hours. Deliverability is rock-solid at 98%+ even at 15,000 cold emails per day across our client portfolios."
David Chen
Director of Business Development • RevEngine B2B (San Francisco, CA)
"We switched from Google Workspace direct to WarmedInboxes and cut our software bill by 45% while actually increasing booked meetings. The 100% replacement guarantee gives us total peace of mind."
Sophie Bennett
Lead Gen Specialist • GrowthForge Agency (New York, NY)
Ready to scale your agency outreach without domain burn?
Deploy pre-warmed mailboxes starting at just $4.00/mailbox/month. Setup takes under 5 minutes.