/
© 2026 RiffOn. All rights reserved.
  1. The SaaS Podcast: Build, Launch & Scale Your SaaS
  2. 456: Mailtrap: From 20,000 Email Disaster to 7-Figure SaaS - with Sergiy Korolov
456: Mailtrap: From 20,000 Email Disaster to 7-Figure SaaS - with Sergiy Korolov

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

The SaaS Podcast: Build, Launch & Scale Your SaaS · Oct 9, 2025

How Mailtrap turned an email mistake into a 7-figure ARR SaaS, using mandatory surveys and fake buttons to drive data-led growth.

Pivoting From Blocking to Sending Emails Created a Core Brand Contradiction

Mailtrap's brand was built on the promise of *preventing* emails from reaching inboxes. When they launched an email *delivery* service, they faced a massive challenge: their new product's goal was the exact opposite of their original one. Overcoming this brand confusion and rebuilding user perception became a primary business obstacle.

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

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

The SaaS Podcast: Build, Launch & Scale Your SaaS·4 months ago

Mailtrap's Mandatory Signup Survey Boosted Insights Without Hurting Conversion

Mailtrap made a multi-step survey a required part of signup. Counterintuitively, this added friction had no negative impact on conversion rates. The collected data on user intent, role, and marketing attribution proved invaluable for segmenting users and focusing on high-value cohorts, informing both product and marketing strategy.

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

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

The SaaS Podcast: Build, Launch & Scale Your SaaS·4 months ago

Simplifying Onboarding for Developers Failed to Increase Mailtrap's Conversions

Mailtrap invested in creating a streamlined, low-friction onboarding experience, assuming it would significantly boost conversions. The change had almost no impact. They discovered their developer audience valued the product's core utility so much that they were willing to complete extra steps, rendering the simplified UX improvements ineffective for conversion.

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

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

The SaaS Podcast: Build, Launch & Scale Your SaaS·4 months ago

Mailtrap's Five Years as a Free Side Project Built a Competitive Moat of Trust

For five years, Mailtrap was a free tool that grew slowly and organically through word-of-mouth in the developer community. This patient, community-led approach established deep-rooted trust and brand loyalty before monetization was ever considered. This foundation became a durable competitive advantage that well-funded competitors could not easily replicate.

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

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

The SaaS Podcast: Build, Launch & Scale Your SaaS·4 months ago

Railsware's 'Product Studio' Model Incubates Diverse, Unrelated SaaS Tools

Railsware operates as a hybrid 'product studio,' using its consultancy arm to fund and staff the creation of its own SaaS products. This model allows it to successfully build and scale multiple, distinct companies like Mailtrap (email tools) and Coupler.io (data analytics) in parallel, despite the model often confusing traditional investors.

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

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

The SaaS Podcast: Build, Launch & Scale Your SaaS·4 months ago

A 'Fake' Menu Button Validated Mailtrap's Next Major Feature

To test demand for an 'email campaigns' feature, Mailtrap added a non-functional button to their main menu. Clicking it led to a survey asking users what they wanted. This simple, no-code experiment generated 300 detailed replies in weeks without any incentives, validating the idea and creating a user-driven feature roadmap before any development began.

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

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

The SaaS Podcast: Build, Launch & Scale Your SaaS·4 months ago

Mailtrap's Seven-Figure Business Was Born From an Accidental Email Blast

Mailtrap was created after its founders made a catastrophic mistake: accidentally sending 20,000 test billing emails to real customers. To prevent a recurrence, they built a simple internal tool to trap test emails. This tool, born from solving an intense, personal pain point, had immediate product-market fit when shared with the developer community.

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

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

The SaaS Podcast: Build, Launch & Scale Your SaaS·4 months ago