Resend

Send with Resend and receive on a Resend receiving domain.

Install

Terminal

npx shadcn@latest add @tendkit/channel-resend

It lands in lib/support/channels/. Import resendChannel from there.

Set up

Verify your sending domain
In Resend, verify acme.com so replies go out from support@acme.com.
Add a receiving domain
Add in.acme.com with receiving on, and its MX record in your DNS. To keep your mailbox, copy support@acme.com to support@in.acme.com (see Email setup).
Create a full access API key
Reading received mail needs more than a sending-only key.
Add the webhook
Point it at /api/webhooks/support/email with email.received, email.sent, email.delivered, email.bounced, email.failed, email.suppressed and email.complained, and pass its signing secret as webhookSecret.

Configure

lib/support/index.ts

resendChannel({
  id: "email",
  apiKey: process.env.RESEND_API_KEY!,
  webhookSecret: process.env.RESEND_WEBHOOK_SECRET!,
  address: "support@acme.com",
  replyAddress: "support@in.acme.com",
  receivingDomains: ["in.acme.com"],
})

Options

Name	Type	Description
`id`*	`string`	Stable channel id, stored on every ticket and used in the webhook URL. Never change it.
`apiKey`*	`string`	A full access key.
`webhookSecret`*	`string`	The webhook's signing secret, "whsec_…".
`address`*	`string`	What customers write to and replies are sent from.
`replyAddress`*	`string`	An address on your Resend receiving domain.
`receivingDomains`	`string[]`	Only accept mail addressed to these domains. Set it when several products share one Resend account.
`fetch / baseUrl`		For tests and proxies.

Behaviour

Delivery, bounce and complaint events update each reply's status, and failures notify your team.
Threading headers are read from the raw message, so they work even when the API omits them.

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