Email infrastructure you control.
Send transactional email with a transparent API, reusable templates, and full delivery visibility.
Event timeline
- Email sent
- Delivered → gmail.com
- Opened → gmail.com
- Clicked → verify link
- Webhook triggered
Built for developers and teams building modern products.
Product capabilities
What you get. No hype.
Sending API
Ship transactional email from your app with one call. Every message and event is visible—no black box.
Domain verification
Get mail delivered and trusted. We guide you through DNS records so your domain authenticates correctly.
Templates
Create consistent emails with reusable templates and dynamic variables—verification, reset, and notifications.
Event timeline
Know what happened to each email. Delivered, opened, clicked, bounced—so you can fix issues quickly.
Everything you need to ship
Templates, domains, webhooks, and real-time events. Built for teams that move fast.
Dynamic Templates
Build once, personalize infinitely. Use variables like {{name}} and {{company}} to create emails that feel personal at scale.
Domain Authentication
SPF, DKIM, DMARC—configured in minutes. Your emails land in inboxes, not spam folders. We guide you through every step.
Webhooks
Get notified instantly when emails are delivered, opened, clicked, or bounced. Keep your app in sync with what actually happened.
See every email event
- Verification email sent
- Delivered → gmail.com
- Opened → gmail.com
- Clicked → verify link
- Webhook triggered
No black box. Every email event is visible.
Send email in seconds
One call. Template or raw content. Full visibility.
await marshmellos.send({
to: "[email protected]",
template: "welcome"
})One API key, template or raw content. Events and webhooks keep your app in sync with what actually happened.
How it works
From signup to first send.
Create account
Sign up with Google, Apple, or work email.
Verify domain
Authenticate your sending domain with DNS records.
Connect API
Generate your API key and integrate your app.
Send email
Deliver transactional emails with full visibility.
Email infrastructure is fragmented; we built Marshmellos to offer a clear product layer—designed for clarity and control.
Why we exist →How Marshmellos compares
Different tools serve different needs. See how we fit alongside other email platforms.
Compare platforms