The founder of RB2B grew the SaaS to $6.3 million ARR, with 32% ($1.9 million) generated by a sophisticated cold‑email engine. The system prioritizes bullet‑proof deliverability (200 warmed‑up domains), AI‑driven personalization, and a four‑month testing cycle, combining three tactics: LinkedIn‑warmed wait‑list outreach, pure cold‑prospect campaigns, and real‑time website‑visitor retargeting that emails prospects within minutes of a visit. Sending 160,000 emails per day, the approach yields 20% of all sign‑ups, a 30% positive‑reply rate and up to a 12.7% conversion on its best campaign—far above the industry norm of 1‑in‑1,000.
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