Services

Email

Send transactional email from your app with one API call, from a CloudHike.dev address or your own domain.

How it works

Tick the box to accept the email acceptable use policy (https://cloudhike.dev/legal/email-policy) and click Deploy on the Email card. You get EMAIL_API_URL and EMAIL_API_KEY. Keep the key on your server: anyone with it can send as your project.

Mail goes out from <project>@cloudhike.dev with no setup, or from any address on a domain you verify.
Transactional email only: sign-in links, password resets, receipts, alerts. No marketing or bulk mail.
Message bodies are never stored. The Logs tab shows who each message went to and what happened.

Send an email

From your server

TypeScript

const res = await fetch(`${process.env.EMAIL_API_URL}/send`, {
  method: "POST",
  headers: {
    "content-type": "application/json",
    "x-api-key": process.env.EMAIL_API_KEY!,
  },
  body: JSON.stringify({
    to: "customer@example.com",
    subject: "Your receipt",
    html: "<p>Thanks for your order.</p>",
    text: "Thanks for your order.",
    from: "receipts@acme.com",   // optional, needs acme.com verified
    fromName: "Acme",
    replyTo: "support@acme.com",
  }),
});
const { results } = await res.json(); // [{ to, id, status }]

Field	Meaning
`to`	One address or an array. Each recipient counts as one email.
`subject`	Up to 200 characters, no line breaks.
`html`, `text`	Send either or both, up to 256 KB each.
`from`	Any address on one of the project's verified domains. Left out, mail goes from `<project>@cloudhike.dev`.
`fromName`	Display name, 1 to 60 characters, with no address or link in it.
`replyTo`	Where replies go. Set it when sending from cloudhike.dev.
`scheduledAt`	ISO time up to 7 days ahead. Answers 202; cancel with `POST {EMAIL_API_URL}/emails/<id>/cancel`.

Send from your own domain

Open the project's Email page, go to Domains and add your domain. A subdomain such as mail.acme.com keeps email reputation apart from your main domain.
Add the records it lists at your DNS provider: three DKIM CNAME records (required), an MX and an SPF TXT record on bounce.<domain>, and a DMARC TXT record (recommended).
Click Verify now, or wait: we check every few minutes for 72 hours. Each record shows whether it was found.
Once the domain shows Verified, send with from set to any address on it.

Free accounts can add 1 domain and Pro accounts 5, across all projects. If the DKIM records are removed later, the domain is marked failed and sending from it stops until you verify it again.

Limits

	Free	Pro
Emails per 24 hours	100	No limit
Emails per month	3,000	No limit
Price	Free	3,000 a month per project included, then $0.40 per 1,000
Emails per minute	10	300
Recipients per request	3	50
Custom domains	1	5

Over a limit the API answers 429 with a Retry-After header.
Each recipient counts as one email. On Pro, emails sent above the allowance are charged from your credits every hour; refused, failed and cancelled messages are free. A monthly spend cap under Settings limits what you can spend.
Addresses that bounce for good or report spam are never mailed again.
Sending pauses for a project whose mail bounces 8% or is reported as spam 0.3% of the time over 7 days.
The Overview tab charts each day's delivered, bounced and failed mail and your bounce and complaint rates.

Use with AI

Let your coding agent send your app's transactional email.

1
Open a terminal in your app's folder and start Claude Code.
Terminal
Shell
```
claude
```
2
Paste the prompt below and press Enter. Approve the file edits and commands it asks about.
3
Optional: save a short note about CloudHike.dev in CLAUDE.md so every session knows about it.

PROMPT

Read https://cloudhike.dev/docs/md/email. Send this app's transactional email (sign-in links, password resets, receipts) through CloudHike.dev: call EMAIL_API_URL/send with EMAIL_API_KEY from server code only, set replyTo, and handle 429 responses.

Replace the placeholders in <angle brackets> before sending. Always review what the agent changes.

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