09 Oct 2025
58m

456: Mailtrap: From 20,000 Email Disaster to 7-Figure SaaS - with Sergiy Korolov

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The SaaS Podcast - Growing Profitable AI SaaS & AI Agents

In this episode of The SaaS Podcast, Omer Khan interviews Sergiy Korolov, co-CEO of Railsware and co-founder of Mailtrap, about building Mailtrap into a successful email testing and delivery platform. Sergiy shares the origin story of Mailtrap, which began as an internal tool to prevent accidental sending of test emails to real customers. He discusses the transition from a free community tool to a monetized product, the importance of customer surveys for product and pricing decisions, and the challenges of shifting from email blocking to email sending. Sergiy also touches on Mailtrap's growth strategies, the impact of AI on software development, and the significance of brand perception in a changing product landscape.

Outlines

Part 1: Introduction to Railsware and Mailtrap

Part 2: Growth, User Insights, and Product Development

Part 3: Conclusion and Personal Insights

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