Send up to 3,000 emails
a month, free.
Get a free email API key and send your first email in one request. REST API and SMTP, SDKs for every language, and deliverability built in — no credit card required.
Free forever — no credit card, no expiry.
Your first email
in one request.
No pitch to read first. Grab your free key, send a single API call or SMTP message, and watch it land. The same key works across every SDK and both transports.
- 01 Create a free account and generate an API key.
- 02 Authenticate your domain with the guided DNS wizard.
- 03 Send — copy a snippet and fire your first email.
Everything you need to ship.
Nothing held back.
Real limits, stated honestly — no asterisks, no "free for 12 months," no credit card on file.
Integrate in minutes,
in your language.
Typed, documented SDKs — plus a plain REST API and SMTP relay for everything else. The Laravel package installs with a single command.
Start free.
Upgrade only when you need to.
The free tier is a real product, not a teaser. Here's how to know when it's enough — and when to move up.
The free tier is enough when…
- Side projects, prototypes, and MVPs
- A SaaS sending under 3,000 emails a month
- Password resets, receipts, and sign-up emails at low volume
- Testing deliverability before you commit
Time to upgrade when…
- You need more than 3,000 emails/month or 100/day
- You send from multiple domains
- You want dedicated IPs and longer log retention
- You need higher rate limits for bursts
See the full breakdown on the pricing page, or read how the transactional email API works for production sending.
Free, without the
sandbox friction.
Most "free" email APIs make you fight a sandbox, wire up DNS by hand, or watch the trial expire. Here's how Lettr's free tier compares to a typical cloud free tier like AWS SES.
| Lettr free | AWS SES free tier | |
|---|---|---|
| Free allowance | 3,000/mo — ongoing, no expiry | 3,000/mo — first 12 months only |
| Start sending | Verify a domain and send | Sandbox by default — request production access |
| Setup | Guided DNS wizard, minutes | Manual DNS + IAM credentials |
| Deliverability tools | SPF, DKIM, DMARC built in | Configure manually |
| Visual editor | Drag-and-drop, powered by Topol | Not available |
| API + SMTP | Both, one free key | Both, separate setup |
| Logs & analytics | Searchable logs + dashboard | CloudWatch, extra setup |
Comparison reflects publicly documented free-tier behavior and may change. AWS and Amazon SES are trademarks of Amazon.com, Inc.
Free, but not
throwaway.
A free key shouldn't mean mail in the spam folder. The deliverability tooling that powers paid plans is on the free tier too.
Authentication on the free tier
SPF, DKIM, and DMARC are not paywalled. A guided DNS wizard authenticates your domain in minutes so your mail lands in the inbox — even on free.
Real sending infrastructure
The free key sends on the same managed, monitored infrastructure as paid plans. Free means a lower limit, not a worse mailbox reputation.
Visibility from day one
See deliveries, bounces, and complaints in the dashboard, and search 7 days of logs to find exactly why a message did or didn’t arrive.
Need help deciding?
Talk to our team about your email infrastructure, volume needs, or migration from another provider.
Talk to an expertFree email API questions
The honest answers free-tier shoppers actually want.
Get your free API key.
Send your first 3,000 emails a month free — no credit card, no sandbox, no expiry. Upgrade only when you outgrow it.