One platform for transactional and broadcast email, billed per send — never per contact. Start on the free tier, scale to millions without your bill quietly following your contact list. Your IP, your reputation, your logs — from the first signup email.
Wire up sending in an afternoon. Grow into audiences, broadcasts, and dedicated IPs without switching tools or re-platforming.
REST API, SMTP, and SDK/CLI. Drop in an API key, send your first verified email, and add SPF, DKIM, and DMARC automatically — no DNS archaeology, no deliverability consultant.
Password resets and receipts run next to your product launches and changelogs. Same contacts, same domains, same analytics — not two products bolted together with two invoices.
mailstein sends from your own server and dedicated IP via the Postal MTA — not a shared SES pool. Your sender reputation is an asset you build, not something you rent and lose on churn.
Most platforms meter marketing email by contacts stored — so a list you email once a month costs the same as one you email daily. mailstein bills per send. A 50,000-contact audience you email twice costs the same as anyone else emailing twice.
Dedicated IPs with automatic, managed warm-up. Bounce and complaint suppression built in so a bad address never burns your reputation twice. The deliverability work a growth-stage team would hire for — handled by the platform.
A real API and a real platform — templates, contacts, campaigns, domains, webhooks, suppressions, analytics — plus an MCP server so your agents can send too.
Idiomatic SDKs, typed responses, and webhooks for every delivery, bounce, open, and complaint. Build against a REST API that behaves like the rest of your stack — then reach for SMTP, the CLI, or the MCP server when you need them.
The choices that feel small at launch compound. Own the infrastructure early and scale never means migrate.
| mailstein | Typical SES wrapper | |
|---|---|---|
| Sends from your own IP + reputation | Yes | Shared pool |
| Transactional + broadcast, one platform | Yes | Add-on / separate |
| Billed per send, not per contact | Yes | Per contact for marketing |
| Message logs live on your servers | Yes | Vendor-held |
| Auto SPF / DKIM / DMARC | Yes | Manual |
| Dedicated IP with managed warm-up | Yes | Higher tier |
| Free tier, no card | 50/mo + domain | Varies |
| SDK / CLI / MCP for agents | Yes | Partial |
Free tier, no credit card, one domain to start. Own your sending from day one — and keep owning it at scale.
Start free →