SMSESMetric

SESMetric · transactional email infrastructure

Transactional mail that always lands.

SMTP relay, REST API, and an MCP server for AI agents. 35+ ready-to-send templates, real-time tracking, and per-email status. No newsletters. No drip funnels. Just delivery.

Start free · 100/dayRead docs
smtp · 4 lines of node
const tx = nodemailer.createTransport({
  host: "smtp.sesmetric.com", port: 2525,
  auth: { user, pass },
});
await tx.sendMail({ from, to, subject, html });

By the numbers

Five years in, the math is consistent.

50B+
Emails delivered
25K+
Active senders
99.9%
Uptime SLA
180+
Countries reached
<2s
Median accept time
SOC 2
Type II infra

Features

Built for the receipts that have to ship.

Send email from any AI agent

Native MCP server at ai.sesmetric.com/mcp. Claude Code, Cursor, custom agents — discover templates, send email, track delivery. Same key as the REST API.

35+ templates, out of the box

Password resets, welcome, receipts, invoices — send any system template via /v1/send without cloning. Branding auto-applied. Customize only when you need to tweak copy.

Event pipeline you can read

Sends, opens, clicks, bounces, complaints — streamed to a dashboard built for actually debugging, not selling you on growth. Per-email status via GET /v1/messages/{id}.

And the obvious table-stakes

Sub-second accept

SMTP ack in under 2s at p95. Worker threads don't block.

Reputation isolation

Per-user routing. Watchdog flips noisy senders off the shared IP.

Developer-first APIs

REST mirrors SES SendRawEmail; SDKs for 10+ languages.

Multi-domain ready

Verify as many sending domains as you like on paid plans.

SOC 2 + GDPR

Type II audited. Data residency on request.

Idempotent retries

Replay-safe Message-ID. No duplicate sends from upstream timeouts.

Webhooks per event

Signed HMAC. Configurable per-type, retry with backoff.

Historical export

CSV out of the dashboard, no quota. Pull deliveries back to your warehouse.

See all features

How it works

Four steps. The longest one is waiting for DNS.

  1. 01

    Sign up + verify

    Email signup. Verify a domain or single address in the dashboard. Total: 60 seconds.

    • No credit card
    • Guided DKIM / SPF setup
    • Auto-poll until DNS clears

  2. 02

    Drop in creds

    Paste SMTP host + creds into the framework you already use. Or hit the REST endpoint with curl.

    • nodemailer / Django / Rails
    • Postmark-shaped REST
    • Per-app API keys

  3. 03

    Send

    Your first message ships in under 5 minutes. The free tier is 100 a day, forever.

    • Idempotent Message-ID
    • Reroute per-user on the fly
    • Sandbox mode for dev

  4. 04

    Watch where it lands

    Live event dashboard. Filter by domain, recipient, status. Export to CSV.

    • Open / click tracking
    • Bounce + complaint feed
    • Webhooks per event
Start the five-minute path Or read the docs first →

Pricing

Start free. Scale only when you ship more than 100 a day.

See full pricing

Free

Try it. No card.

$0/mo

100 / day

  • 1 sending domain
  • SMTP + REST
  • DKIM + SPF auto
Start free

Monthly

Predictable.

$99/mo

1M / month

  • Unlimited domains
  • Email validation API
  • Priority support
Start monthly
Best value

Annual

Two months free.

$999/yr

1M / month

  • Everything in Monthly
  • Extended support hours
  • Locked rate
Start annual

FAQ

The questions everyone asks first.

Still confused? Drop us a line — actual engineers reading the inbox.

Contact

Ready when you are

Your first transactional mail ships in five minutes.

Sign up, paste SMTP creds, send. Free tier gives you 100 a day to test against, forever. Upgrade only when you cross that line.

Start freeRead docs

No card · 100 emails / day free, forever · cancel paid plans any time