@levelsio@levelsio
If you wanna switch to @Cloudflare Email Sending today, here's my prompt for you, as always I'm unaffiliated, not paid, not sponsored, but I like it, make sure you remove the space before the .com in the API url I added to avoid it becoming a link in this tweet:
# Prompt: Migrate transactional email to Cloudflare Email Service
Paste this into Claude Code (or Cursor, or any agent) running inside your project.
---
I want to migrate this codebase's outbound email from its current provider (Postmark / SES / Resend / SendGrid / Mailgun / etc.) to Cloudflare Email Service (public beta, launched April 2026). Help me do this carefully.
## Context: what Cloudflare Email Service is
A new transactional email API from Cloudflare. Endpoint:
```
POST https://api.cloudflare .com/client/v4/accounts/{ACCOUNT_ID}/email/sending/send
Authorization: Bearer {API_TOKEN}
Content-Type: application/json
```
Request body:
```json
{
"to": "user@example.com", // string OR array of strings
"from": "no-reply@yourdomain.com", // string OR {"address":"x@y","name":"Display"}
"subject": "...",
"html": "
...
", // optional
"text": "...", // optional (one of html/text required)
"cc": ["..."], // optional, array
"bcc": ["..."], // optional, array
"reply_to": "...", // optional, single string
"headers": {"List-Unsubscribe": "<...>"} // optional, e.g. for newsletters
}
```
Success response: HTTP 200 + `{"success":true,"result":{"delivered":[],"queued":[],"permanent_bounces":[]}}`.
Failure: non-200 OR `success:false` OR non-empty `permanent_bounces`. Always check all three.
Pricing: $5/mo Workers Paid plan + 3,000 emails free + $0.35 per 1k after. Roughly 5× cheaper than Postmark. No batch send endpoint — loop single sends.
## Steps you should follow
### 1. Verify prerequisites with me
Before writing any code, ask me to confirm:
- I have a Cloudflare Workers Paid plan ($5/mo)
- I've onboarded my sender domain(s) in Cloudflare dashboard → Email → Email Sending → Onboard Domain (this auto-adds SPF/DKIM/DMARC + cf-bounce MX records)
- I have an API token with `email_sending:write` scope (created at → Custom Token)
- I have my Cloudflare account ID
Don't proceed until you have these.
### 2. Recommend a domain reputation strategy
Most apps should split senders across 2-3 subdomains so spam complaints on one don't drag down deliverability on others:
- `mail.
