I just launched Cllavio — an email marketing + email API platform built from scratch

Hey Indie Hackers,

After a long grind, I finally launched Cllavio — an email marketing platform + email API that I built from the ground up as a solo founder.

I started working on this because I kept seeing the same problem over and over:

• small businesses paying too much for email tools,

• SaaS founders hitting limits immediately,

• developers fighting slow or outdated APIs,

• deliverability being a black box,

• and basic features locked behind crazy pricing.

Instead of complaining about it, I built my own solution.

What Cllavio does

• Email marketing campaigns

• Transactional email API (SMTP + REST)

• Advanced analytics (opens, clicks, bounces)

• Contact management

• High-deliverability SMTP setup

• Fair, simple pricing

• Clean UI built for speed

• Built-in authentication (SPF, DKIM, DMARC)

Everything is running on infrastructure I manage myself — Postfix on EC2, Spring Boot microservices, RabbitMQ, Next.js frontend, and React Native for the companion app.

Why I built it

Because existing tools felt bloated and overpriced.
Founders shouldn’t need enterprise budgets just to send emails reliably.

I wanted something:

• simple

• fast

• transparent

• affordable

• developer-friendly

• and genuinely deliverable to inboxes, not spam folders

The hard part

Building an email platform from scratch is way harder than it looks:

• running SMTP servers

• warming up IPs

• managing bounces

• tracking opens/clicks

• email rendering issues

• throttling rules

• deliverability reputation

• domain verification

• analytics accuracy

• queue workers

• EC2 scaling

• UI/UX polish

• production reliability

There were days where I legitimately thought: “Why am I even doing this?”
But I kept going.

Where it is today

Cllavio is live, working, and already sending real emails for real businesses.
It’s still early, but it’s stable and improving every day.

What’s next

• Growth

• More integrations

• More analytics

• Automation features

• Better onboarding

• More customer feedback

If anyone here wants to test it, break it, give feedback, or just follow the journey, I’d genuinely appreciate it.

Thanks IH — I’ve learned a lot from watching other founders build publicly.
Now it’s my turn to do the same.

If you want to check it out: https://cllavio.com