The teams running outbound at scale don't want a tool — they want infrastructure they can resell. Here's who sends through their own mailboxes on NuMail, and the numbers they put their name behind.
Not vanity numbers. The operational thing that changed the day they moved their sending onto their own mailboxes.
We were invoicing clients by hand and chasing payment every month. Stripe Connect onboarding took twelve minutes and we migrated 23 sub-workspaces in three days. Now it bills itself — we run a real SaaS, not a spreadsheet.
The reply detection is the unlock. A prospect replies and the Claude draft is sitting in our unibox before our AE has tabbed back to it. We went from same-day replies to same-minute, and our booked-call rate climbed 34% in a quarter.
We don't have a single human logging into a dashboard. Our agents create campaigns, enroll leads, and approve AI drafts over the MCP server. NuMail is the only platform whose API was clearly written for machines to drive, not just to demo.
Half our client domains were landing in Promotions. The cross-customer warmup pool fixed deliverability we'd been fighting for a year — real conversations from real mailboxes, not a bot net. Placement is up 22 points and our churn basically stopped.
Pulled from G2 and Product Hunt. We left the typos in.
Owning the mailboxes instead of renting some pooled IP changed everything. Deliverability is night and day and I can actually explain to clients where their emails send from.
I run all of my outbound solo. The AI drafts sound like me, the unibox sorts the noise, and I approve replies from my phone between meetings. It's the first cold-email tool I haven't cancelled.
The REST API and MCP server are genuinely best-in-class for this category. HMAC webhooks, idempotency keys, cursor pagination — it reads like an infra product, not a marketing one. We built our whole sequencer on it.
Join 312 agencies and thousands of founders running outbound infrastructure they actually own. 14-day trial, no card to start.