Send transactional and marketing email from your own server and IP. Automatic SPF, DKIM & DMARC, dedicated IPs, real-time delivery logs — the deliverability of a big ESP, on infrastructure you control. Billed per send, never per contact.
Anyone can hand you an API. mailstein hands you the whole pipe — the reputation, the IP, the logs, the control — engineered so your mail lands in the inbox and stays there.
Mail leaves from your own IP and every message log lives on your servers. No shared black box, no vendor holding your reputation hostage.
Automatic SPF, DKIM, DMARC and return-path. Dedicated IPs with managed warm-up. Bounce & complaint suppression that guards your sender score.
Grow your list to a million without a bigger invoice. You pay for mail you actually send — transactional and broadcast, one simple meter.
The real product — not a promise. This is what you actually get.
Add your domain, copy four DNS records, done. mailstein generates SPF, DKIM, return-path and DMARC for you and watches them turn green — no "request production access" queue, no waiting on a support ticket.
Search every email you've sent, with the full delivery timeline — sent, delivered, opened, clicked, bounced — plus the device and location behind each open. Debug a "they never got it" ticket in seconds, on logs that live on your infrastructure.
Send order confirmations and password resets, then turn around and ship a product announcement to your whole list — from the same domains, the same reputation, the same dashboard. Everyone else makes you buy two products and bills your marketing by the contact. We don't.
The others rent you access to their servers. mailstein gives you the infrastructure — which is exactly why deliverability, control, and pricing all land in your favour.
| mailstein | Resend | Postmark | Amazon SES | |
|---|---|---|---|---|
| Sends from infrastructure you own | Yes | No | No | No |
| Transactional + broadcast, one price | Yes | Contacts billed extra | Separate product | Transactional only |
| Billed per send, never per contact | Yes | No | No | Yes |
| Dedicated IP + managed warm-up | Yes | Add-on | $50/mo | Manual |
| Message logs stay on your servers | Yes | No | No | No |
| Full dashboard, SDK, CLI & MCP | Yes | Yes | Partial | Bare API |
Deliverability is the product. We invest in it, and price for teams whose email is too important to gamble on the cheapest relay. Start free, upgrade when it's carrying real revenue.
Every plan: transactional + broadcast on one meter. Per send — never per contact.
| What's included | Free | Pro | Scale | Enterprise |
|---|---|---|---|---|
| Sending | ||||
| Emails / month | 50 | 25,000 | 150,000 | 1M+ |
| Domains | 1 | 5 | Unlimited | Unlimited |
| Transactional API + SMTP | ✓ | ✓ | ✓ | ✓ |
| Broadcasts & audiences | — | ✓ | ✓ | ✓ |
| Deliverability | ||||
| SPF / DKIM / DMARC automation | ✓ | ✓ | ✓ | ✓ |
| Suppression & reputation tooling | — | ✓ | ✓ | ✓ |
| Dedicated IP + managed warm-up | — | — | ✓ | Pools |
| Platform | ||||
| SDK · CLI · MCP | ✓ | ✓ | ✓ | ✓ |
| Logs on your own infrastructure | ✓ | ✓ | ✓ | ✓ |
| Support | Community | Priority | SLA | |
A typed SDK, a CLI, and an MCP server — so your app, your terminal, and your AI agents all send through the same premium pipe.
Verify a domain, grab a key, send in five minutes. Then never rent your inbox reputation again.
Start free →