Transactional email, delivered reliably at any scale
REST API or SMTP relay, smart provider failover, deliverability protection, and tenant isolation enforced at the database layer — not just in application code.
# One API call, real failover behind it
curl https://your-app.example.com/v1/send \
-H "X-API-Key: $KEY_ID:$KEY_SECRET" \
-d '{
"to": "user@example.com",
"from": "you@yourdomain.com",
"subject": "Welcome!",
"html": "<p>Thanks for signing up</p>"
}'
# 202 Accepted
{
"status": "queued",
"correlation_id": "corr_8f2e..."
}Sends through the providers you already trust
Everything you need to send with confidence
Built for teams who need real isolation and reliability, not just a wrapper around one provider.
REST API or SMTP relay
Send via a simple POST /v1/send call, or point smtplib, PHPMailer, Nodemailer, or WordPress at our SMTP relay on port 587 (STARTTLS) or 465 (SSL/TLS) — no code changes required.
Database-level tenant isolation
Every tenant's data is walled off by PostgreSQL Row-Level Security, not just application filters — enforced by dedicated, minimally-privileged database roles.
Smart provider failover
Messages route across AWS SES, SendGrid, and Mailgun with automatic fallback on 421/550 responses and timeouts, so a single provider outage doesn't stop delivery.
Encrypted provider credentials
Provider secrets and DKIM keys are protected with envelope encryption — nothing sensitive is ever stored or logged in plaintext.
Domain verification
Mail only goes out from domains with verified SPF, DKIM, and DMARC, protecting your sender reputation before any real traffic goes out.
Campaigns, tracking & analytics
Reusable contact lists, open/click tracking, one-click unsubscribe, and real-time delivery/bounce/complaint analytics per domain.
Signed outbound webhooks
Delivery, bounce, and complaint events are pushed to your endpoint with HMAC-SHA256 signatures and SSRF-safe destination validation.
Bring your own IP
Register your own VPS and we'll deploy and verify a dedicated mail server on it over SSH — full control over sending IP and reputation.
From signup to first send in minutes
Create your account
Sign up and get an API key pair instantly — no waiting on manual approval.
Verify your sending domain
Add the SPF, DKIM, and DMARC records we generate for you to exit sandbox mode.
Send
Call the REST API or connect your existing SMTP client — delivery and failover are handled for you.
Already using SMTP? Just point it here.
No migration needed — connect your existing mail client or library to our SMTP relay on port 587 (STARTTLS) or 465 (SSL/TLS) with AUTH LOGIN or AUTH PLAIN, and get provider failover and deliverability protection for free.
Security isn't a checkbox here
The isolation and encryption guarantees below are enforced by the database and API layer, not just documented in a policy.
Row-level tenant isolation
Postgres RLS with FORCE ROW LEVEL SECURITY on every tenant table — not an application-layer filter that a bug can bypass.
Envelope-encrypted secrets
ESP credentials, SSH passwords, and DKIM private keys are encrypted at rest, scoped per tenant, and never returned by the API once set.
Signed, verifiable webhooks
Every event we push is HMAC-SHA256 signed so you can verify it actually came from us before acting on it.
No record, no send
Sending is blocked at the API level for any domain without fully verified SPF, DKIM, and DMARC — enforced automatically, not just recommended.
Simple pricing that scales with you
Unlimited sending on every plan: you send through your own ESP accounts and pay them directly. Plans scale with your contacts, domains and accounts.
Free
For trying it out with your own ESP account.
- 10,000 contacts
- 1 domain
- 1 ESP account
- 1 login
- 10 campaigns / month
- Dashboard sending only (no API)
- No daily or monthly sending limit
Starter
For small teams automating their email.
- 100,000 contacts
- 3 domains
- 2 ESP accounts with failover
- 1 of your own servers
- 3 team members
- Unlimited campaigns
- REST API + SMTP relay
- 300 send requests / min
- No daily or monthly sending limit
Growth
For growing products and lists.
- 500,000 contacts
- 10 domains
- 5 ESP accounts with failover
- 3 of your own servers
- 10 team members
- Unlimited campaigns
- REST API + SMTP relay
- 1,200 send requests / min
- No daily or monthly sending limit
Business
For large lists and multiple brands.
- 2,500,000 contacts
- Unlimited domains
- Unlimited ESP accounts
- 5 of your own servers
- Unlimited team members
- Unlimited campaigns
- REST API + SMTP relay
- 3,000 send requests / min
- No daily or monthly sending limit
Enterprise
For high-volume senders with custom requirements.
- Custom contact & server limits
- SLA
- Dedicated success contact
- Custom security review
- Annual billing
Prices shown are indicative and may change. Contact us for volume discounts.
Frequently asked questions
Yes. You connect your own provider accounts (Amazon SES, SendGrid, Mailgun or any SMTP relay) or your own server, and keep your own pricing and sending reputation. We give you one API and SMTP endpoint in front of all of them, with automatic failover between the accounts you configure.
Ready to send?
Create an account and get your API key instantly — no sales call required.
Create your account