Warmup Inbox

The problem

B2B sales teams were burning through domains, new mailboxes hit spam within days, and even seasoned senders saw reputation collapse after a single bad campaign. There was no reliable, hands-off way to warm up an inbox to human-like behavior at scale.

Approach

• Built a peer-to-peer warmup network where thousands of inboxes send, reply, and mark each other's mail as important, indistinguishable from real human conversation.
• Shipped a reputation dashboard with per-provider (Google / Outlook / Yahoo) inbox placement, spam rate, and category scoring, refreshed daily.
• Designed a rate-shaping engine that ramps sending volume based on reputation deltas, back-off signals, and provider-specific tolerance windows.
• Wired native integrations with Instantly, Smartlead, Lemlist, Apollo, and Outreach so warmup runs quietly alongside live campaigns.

Results

• 4.9★ average across G2, Capterra, and Trustpilot, High Performer badges in the last four quarters.
• Customers routinely go from <40% inbox placement to 90%+ within 3–4 weeks.
• Trusted by Ramp, Wishpond, Growbots, Decimal, and Meveto to protect their outbound programs.