Resend (send email)

• Status: Available
• Shelf: Email
• How you connect: API key
• Regions: global (not available to Kazakhstan-only workspaces)
• The service’s own API reference: https://resend.com/docs/api-reference/emails/send-email

Apps send email from your own domain through Resend. Resend is reached through the HTTP API connector with a preset: the gate calls only api.resend.com, only with POST, only under /emails. The API key is sealed to the gate and apps never see it.

Status: Available through the HTTP API preset. The preset follows Resend's API reference (checked 2026-10-16). It has not been run against a live Resend account; the first real send is the first real test.

Connect it#

1. In Resend, open API Keys and create a key with Sending access (resend.com/api-keys). A sending-only key is enough and is the least privilege: it cannot read or change anything else. It starts with re_.
2. Add and verify the domain you send from (resend.com/domains). Resend refuses a from address on an unverified domain.
3. Qaldy → Connectors → Resend → Connect Resend → paste the key → Seal and connect.

Test connection only checks that the sealed key opens. A sending-only key can't read anything and the only call the gate allows is a send, so a test would have to send an email; it does not.

To send from your own domain, see send-from-your-domain.md: the records to add, and a check in Settings, Domains that reads your DNS and says which are in place.

What the gate allows#

Use it from an app#

The manifest names the connection in scope:

{ "id": "http", "actions": ["request"], "scope": "conn_k3v9…" }

const api = ctx.connectors.http('conn_k3v9…')
await api.post('/emails', {
  json: {
    from: 'Moss & Ember <orders@mossember.example>',
    to: ['aigerim@example.com'],
    subject: 'Beans are below 5 kg',
    html: '<p>Reorder before Friday.</p>',
  },
})

A reply outside 2xx throws a ConnectorError with Resend's own message (upstream_error), for example 403 for an unverified domain or 422 for a bad address.

When it breaks#