MailRush

A bootstrapped cold email outreach platform serves small businesses that need affordable, straightforward email automation without enterprise complexity. Built and operated by a solo founder as a lean micro-SaaS, the tool handles sending, tracking, and optimizing cold email campaigns at scale — focusing exclusively on the essential workflows that drive outbound sales. The platform has grown to $10,000 in monthly recurring revenue, demonstrating that a tightly scoped product solving a well-defined pain point can sustain a profitable one-person company generating $120,000 per year.