Early access
Enterprise-grade behavioral email, priced for one developer.
Track what people do in your app, then send email that reacts to it — onboarding, win-backs, upgrade nudges. No sales call, no annual contract, no six-figure floor.
01 — The gap
You shipped the app. The emails never happened.
Newsletter tools don't know your app
They send to a list. They can't tell who finished onboarding and who bounced off at step two.
Lifecycle platforms want a contract
The big platforms solve the right problem at a price that assumes a growth team behind it.
Rolling your own eats a month
SES plus cron plus a suppression table plus unsubscribe handling plus GDPR. That's the month you wanted to spend on features.
02 — How it works
Send an event. Get a campaign.
Post the handful of events that should trigger email. Keep your analytics stack exactly where it is.
// Swift SDK
MailJawn.track("trial_started", properties: ["plan": "pro"])
# Or plain HTTP
curl -X POST https://mailjawn.com/api/v1/events/track/ \
-H "Authorization: Bearer $MAILJAWN_API_KEY" \
-d '{"event": "trial_started", "email": "dev@example.com"}'Behavioral, not blast
Start a series on an event, on signup, on a schedule, or on going quiet. Exit it the moment they convert.
Built on app data
Filter on events and properties you already send, not just tags you remembered to apply.
Deliverability handled
Custom tracking domains, unsubscribe headers, suppression lists, and GDPR erasure come with the box.
03 — The MCP server
Drive it from the editor you already have open.
MailJawn ships an MCP server. Claude or Cursor can draft the campaign, build the segment, and read the open rate back to you — in the same window where you fixed the bug that caused the churn.
> "Write a win-back email for users who haven't opened the app
in 30 days, preview it to me, then schedule it for Tuesday."04 — Where it fits
Honest about the edges.
| If you want | Reach for |
|---|---|
| A weekly newsletter to a list | A newsletter tool — MailJawn does it, but that's not the point |
| Email that reacts to in-app behavior, run by one person | MailJawn |
| Cross-channel orchestration with a growth team and a procurement process | An enterprise lifecycle platform |
05 — Questions
Before you sign up.
How is this different from an enterprise lifecycle platform?
Same core idea — track what people do, message them based on it. MailJawn drops the sales process, the annual contract, and the seat minimums.
Do I have to replace my analytics?
No. Send the few events that should trigger email. PostHog, Amplitude, or whatever you use stays exactly where it is.
What's the MCP server for?
It exposes the API as tools any MCP client can call, so your AI assistant can handle campaigns without you switching apps.