Migrate from Resend
to Posthawk
Switch from Resend to Posthawk while keeping the modern developer experience you love. Same React Email support, now with full infrastructure control.
Migration steps
Export your templates
If you're using React Email components, you already have your templates in code. No export needed — they'll work with Posthawk's template system.
Deploy Posthawk
Use Docker Compose to spin up Posthawk in minutes. The architecture is similar: REST API for sending, dashboard for monitoring.
Configure your domain
Add your sending domain in the Posthawk dashboard. Posthawk uses BYODKIM for stronger authentication compared to Resend's shared DKIM.
Tip: Posthawk generates a unique DKIM key pair per domain — no shared signing infrastructure.
Update API calls
The Posthawk API is structured similarly to Resend's. Most changes are endpoint URLs and the auth header format.
Test delivery
Send test emails and verify DKIM alignment, delivery rates, and webhook events. Check the dashboard for real-time delivery monitoring.
Go live
Switch production traffic to Posthawk. Since both services use standard DKIM, the transition is seamless for recipients.
API mapping
Before & after
import { Resend } from 'resend';
const resend = new Resend(process.env.RESEND_API_KEY);
await resend.emails.send({
from: 'hello@yourapp.com',
to: 'user@example.com',
subject: 'Welcome!',
react: <WelcomeEmail name="User" />,
});import { render } from '@react-email/render';
const html = await render(<WelcomeEmail name="User" />);
const response = await fetch('https://api.posthawk.dev/api/v1/email/send', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'x-api-key': process.env.POSTHAWK_API_KEY,
},
body: JSON.stringify({
to: 'user@example.com',
from: 'hello@yourapp.com',
subject: 'Welcome!',
html,
}),
});Common gotchas
Pre-render React Email components
Resend renders React Email server-side automatically. With Posthawk, pre-render your components using @react-email/render before sending the HTML.
Auth header change
Resend uses Authorization: Bearer re_xxx. Posthawk uses x-api-key header. A simple find-and-replace in your codebase.
Inbound webhook format differs
Both Resend and Posthawk support inbound email, but webhook payload formats differ. Update your inbound handler to match Posthawk's JSON structure.
Data residency differences
Resend stores all data in the US regardless of sending region. Self-hosted Posthawk gives you full control over where your data lives.
More migration guides
Migrate from Postmark
Move from Postmark to Posthawk and cut your email costs by up to 10x while maintaining the same delivery quality through AWS SES.
Read guideReady to migrate?
Deploy Posthawk and start sending in minutes. Free to self-host, no credit card required for cloud.