The email platform we wanted to use.
Drin started from a familiar frustration: email APIs that gate the free tier to a single domain, hide deliverability behind a green badge, and suspend you without warning the moment volume gets interesting. We built the opposite.
Transactional email is infrastructure. It should be boring, honest, and hard to break.
When a password reset doesn't arrive, a customer is locked out. When a receipt lands in spam, support gets a ticket. The mail Drin sends is rarely glamorous and always important — so we treat reliability and inbox placement as the product, not as a paid add-on.
We charge the products that send, not the developers who build, and we give away the things that shouldn't cost more to run — domains, projects, teammates. The bill only grows with the one thing that genuinely scales: volume.
Five principles we build by.
Deliverability is a feature
Authentication, isolation and reputation monitoring ship with every plan — including the free one.
Honesty over hand-waving
We show the real state of your domains and reputation, and we don't claim certifications we don't hold.
Fair use, not surprise bans
Clear rules, graduated trust, and a heads-up before we ever pause a sender — never a silent suspension.
Breadth free, depth metered
Domains, projects and seats are free. We meter the volume that actually scales infrastructure — nothing else.
Built for developers & agents
A clean REST API, typed SDKs, an MCP server and CLI — so humans and the agents they ship both send the same way.
Infrastructure, not lock-in
Standard REST and SMTP mean migrating in — or out — is a credential swap, not a rewrite. We earn the renewal.
Build on email you can count on.
Test in the sandbox today, or tell us what you're building.