Building Mailblock: Why We're Solving Cold Email for Developers
Three months ago, I was staring at a $300/month quote for basic cold email software. The demo felt like using Windows 95. Their "API" was three poorly documented endpoints. I closed my laptop and decided to build what I actually wanted to use.
Today, I'm sharing our progress on Mailblock - the cold email platform we're building specifically for developers, solo founders, and technical teams who are tired of enterprise tools that don't understand how we work.
The Breaking Point
The frustration had been building for months. Every cold email platform we evaluated fell into the same traps:
- Pricing designed for Fortune 500 companies, not bootstrapped startups measuring runway in months
- Interfaces that assume you've never seen code, with drag-and-drop builders and no programmable logic
- APIs treated as afterthoughts, if they existed at all
- Zero integration flexibility - everything revolves around CSV uploads and manual campaign setup
The final straw came when a popular platform's "integration specialist" told me their webhook system couldn't handle conditional logic. In 2025. For a SaaS product.
That's when we decided to stop complaining and start building.
What We're Building
Mailblock is cold email marketing that thinks like code.
Instead of fighting admin panels, you integrate email campaigns directly into your application logic. Instead of paying enterprise prices, you get developer tool pricing starting at $15/month. Instead of wrestling with bad documentation, you get SDKs that actually work.
We're targeting three core problems:
1. Developer Experience That Doesn't Suck
- Native Python and Node.js SDKs with proper documentation
- Function calls instead of web form submissions
- Webhook systems that handle complex logic
- Error messages that tell you what's actually wrong
2. Pricing That Makes Sense for Startups
- $15/month starter plans with generous limits
- No hidden costs for "premium" features like API access
- Pay for what you use, not what enterprise sales teams think you should pay
3. Integration Flexibility
- Trigger campaigns from user actions in your app
- Connect directly to your database
- Build custom automation logic
- A/B test programmatically
Current Progress
We launched our MVP two weeks ago with a small group of beta users. Here's what we've learned so far:
The Good:
- Setup time averaging 8 minutes (goal was under 10)
- 94% of test emails reaching inboxes (deliverability is working)
- Zero support tickets about SDK documentation (big win)
- Early users sending 40% more emails than their previous platforms
The Challenges:
- AI email generation needs work on tone matching
- Campaign analytics dashboard feels too basic
- Need more webhook triggers for complex automations
- Mobile experience needs attention
This Week's Priorities:
- Shipping improved AI writing with better context awareness
- Adding campaign performance insights that actually matter
- Building webhook triggers for user lifecycle events
- Starting work on the mobile interface
Building in Public: The Reality
Sharing progress publicly feels vulnerable but valuable. We've gotten feature requests we never would have considered, caught bugs before they became problems, and connected with other founders solving similar challenges.
The feedback loop is incredible. Instead of building in isolation and hoping we got it right, we're course-correcting weekly based on real usage patterns.
Recent feedback that changed our roadmap:
- "Can you trigger emails based on Stripe subscription changes?" (now building)
- "The AI writes too formally for our startup audience" (shipped last week)
- "We need email templates that don't look like marketing emails" (in progress)
What's Next
Short term (next 4 weeks):
- Improved AI email writing with personality matching
- Advanced campaign analytics and A/B testing tools
- Stripe and other payment platform integrations
- Template library focused on developer-to-developer outreach
Medium term (next 3 months):
- More SDK languages (Go, Ruby, PHP)
- Advanced automation workflows
- Team collaboration features
- Enterprise compliance features (for teams that need them)
Long term vision:
- The default choice for technical teams doing cold outreach
- Platform that scales from solo founder to enterprise without changing tools
- Ecosystem of integrations that make email marketing invisible infrastructure
Early Access and Feedback
We're offering early access with locked-in pricing for the first 100 teams. If you're building something and need cold email that doesn't fight your development workflow, we'd love your feedback.
What we're looking for:
- Developers who have struggled with existing email tools
- Teams that want to integrate email into their product logic
- Solo founders who need affordable, powerful outreach tools
- Anyone willing to share honest feedback as we build
The platform is functional but evolving fast. Perfect for teams that want to influence the direction of a tool they'll actually use.
The Meta Lesson
Building Mailblock has reinforced something we suspected: there's a huge gap between tools built for "business users" and tools built for people who write code.
We don't want different features. We want the same features implemented in ways that make sense for how we work. APIs instead of forms. Code instead of clicks. Integration instead of isolation.
The market is big enough for tools that serve both audiences. But right now, almost everything skews toward non-technical users, leaving developers to adapt or build their own solutions.
We're betting there are enough of us who want developer-first email marketing to build a sustainable business around it.
Ready to try Mailblock? Get early access here and help us build the email platform you actually want to use.
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