Transactional email
your product can rely on.
Fire password resets, receipts, and alerts from a clean REST API or SMTP relay. Sub-second delivery, automatic retries, and a drag-and-drop editor your team owns — no dev ticket to change a button.
3,000 emails/month free. No credit card required.
Everything your product's email needs.
Nothing it doesn't.
The emails that have to arrive — reset links, receipts, 2FA codes — deserve infrastructure built for exactly that.
REST API + SMTP relay
Send your first email with a single POST. Or point your existing SMTP credentials at Lettr and change nothing else — same code, better delivery.
SDKs for every language
First-class Laravel package with a one-command install. Typed, documented SDKs for PHP, Node.js, Go, Java, and Rust — plus a plain REST API for everything else.
Deliverability built in
SPF, DKIM, DMARC, custom tracking domains, and dedicated IPs are first-class. A guided DNS wizard gets you authenticated in minutes — no CNAME guesswork.
Reliable by design
Sub-second sends with automatic retries and idempotency keys, so a flaky network never sends the same password reset or 2FA code twice.
Webhooks for every event
Know the moment an email is delivered, opened, clicked, or bounced. Build automations, sync your database, or trigger in-app flows on signed, retried payloads.
Searchable logs
Full-text search across every email you have ever sent. Filter by recipient, status, or tag and find exactly why that one email bounced — in seconds, not hours.
Know what happened
to every email.
Lettr fires a signed webhook the moment something changes — delivered, opened, clicked, or bounced. React in real time and keep your own database in sync, without polling.
- delivered, opened, clicked, bounced, and complained events
- HMAC-signed payloads you can verify
- Automatic retries with exponential backoff
- Up to unlimited endpoints, filtered by event type
- Every send searchable in the logs for up to 90 days
{
"event": "email.delivered",
"email_id": "msg_8f21c0",
"to": "alex@example.com",
"subject": "Your login code",
"tags": ["auth", "2fa"],
"timestamp": "2026-04-18T09:21:04Z"
} The emails your product
already has to send.
Every transactional email a SaaS sends, from the first verification link to the final invoice.
Need help deciding?
Talk to our team about your email infrastructure, volume needs, or migration from another provider.
Talk to an expertPro
50K emails · $0.80 / 1,000 extra
- Up to 10 sending domains
- 1 inbound route
- Up to 10 webhook endpoints
- No daily sending limit
- Advanced analytics
- 30-day data retention
- No dedicated IPs
Enterprise
Unlimited emails, dedicated IPs, SLA guarantee, SSO/SAML, and a dedicated account manager.
Compare plans
Swipe to compare →| Feature | Free | Pro | Business | Enterprise |
|---|---|---|---|---|
| Monthly emails | 3,000 | 100K emails | 200K emails | Unlimited |
| Daily limit | 100 / day | No limit | No limit | No limit |
| Sending domains | 1 domain | 10 domains | Unlimited | Unlimited |
| Inbound routes | 1 | 10 | Unlimited | |
| Webhook endpoints | 1 | 10 | Unlimited | Unlimited |
| Email API & SMTP | ||||
| Analytics | Basic | Advanced | Advanced | Advanced |
| Data retention | 7 days | 30 days | 30 days | 90 days |
| Team members | ||||
| Dedicated IPs | Add-on | |||
| Priority support | ||||
| SLA guarantee |
Frequently asked questions
Common questions about Lettr's email platform for SaaS companies.