# Resend > Send and manage emails via the Resend CLI. Covers sending, domains, contacts, segments, broadcasts, templates, topics, webhooks, and API keys. - Skill: `dvcrn/resend-3` (Agent Skill) - Install (CLI): `npx skillmds@latest add dvcrn/resend-3` - Raw SKILL.md: https://api.skillmd.com/api/skills/dvcrn/resend-3/raw - Safety review: pending (external: skill-scanner PASS, skillspector CAUTION) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Integrations & APIs - Author: dvcrn (https://skillmd.com/u/dvcrn) - Updated: 2026-09-09 - Page: https://skillmd.com/skills/dvcrn/resend-3 --- # Resend CLI — Email for Developers Official CLI for [Resend](https://resend.com). Covers sending, domains, contacts, segments, broadcasts, templates, webhooks, and API keys. ## Prerequisites - Install: `brew install resend/cli/resend` (recommended) or `npm install -g resend-cli` - Auth: `resend login` or set `RESEND_API_KEY` env var - Credentials stored at: `~/.config/resend/credentials.json` (0600 permissions) - For automation, use a domain-scoped `sending_access` key (not full-access) when possible ## Auth Key priority: `--api-key` flag > `RESEND_API_KEY` env var > `~/.config/resend/credentials.json`. Always use `--json` or `--quiet` flag for non-interactive (agent) usage — forces JSON output, no spinners. ## Quick Reference ### Emails ```bash # Send resend emails send \ --from "Name " \ --to recipient@example.com \ --subject "Subject" \ --text "Body" \ --json # Send with HTML file resend emails send --from you@domain.com --to user@example.com \ --subject "Newsletter" --html-file ./email.html --json # Send with attachments resend emails send --from you@domain.com --to user@example.com \ --subject "Report" --text "See attached" --attachment ./report.pdf --json # Schedule for later resend emails send --from you@domain.com --to user@example.com \ --subject "Later" --text "Hi" --scheduled-at 2026-08-05T11:00:00Z --json # With CC, BCC, reply-to, tags, headers resend emails send --from you@domain.com --to user@example.com \ --subject "Meeting" --text "Notes" \ --cc manager@example.com --bcc archive@example.com \ --reply-to noreply@example.com \ --tags category=marketing --headers X-Entity-Ref-ID=123 --json # Batch send (up to 100 emails from JSON file) resend emails batch --file ./emails.json --json # File format: [{"from":"...","to":["..."],"subject":"...","text":"..."},...] # List sent emails resend emails list --json # Get email details resend emails get --json # Cancel scheduled email resend emails cancel --json # Update scheduled email resend emails update --scheduled-at 2026-08-06T09:00:00Z --json ``` ### Inbound (Receiving) Emails ```bash # List received emails resend emails receiving list --json # Get received email resend emails receiving get --json # List attachments resend emails receiving attachments --json # Get single attachment resend emails receiving attachment # Forward received email resend emails receiving forward \ --to user@example.com --from you@domain.com --json ``` ### Domains ```bash # List domains resend domains list --json # Create domain (returns DNS records to configure) resend domains create --name example.com --region eu-west-1 --tls enforced --json # Create with receiving enabled resend domains create --name example.com --sending --receiving --json # Verify domain (trigger DNS check) resend domains verify --json # Get domain details + DNS records resend domains get --json # Update domain settings resend domains update --tls enforced --open-tracking --json # Delete domain resend domains delete --yes --json ``` Domain lifecycle: create → configure DNS → verify → get (poll until "verified"). Regions: `us-east-1`, `eu-west-1`, `sa-east-1`, `ap-northeast-1`. ### Contacts ```bash # List contacts resend contacts list --json # Create contact resend contacts create --email jane@example.com \ --first-name Jane --last-name Smith --json # Create with properties + segments resend contacts create --email jane@example.com \ --properties '{"company":"Acme","plan":"pro"}' \ --segment-id --json # Get contact (by ID or email) resend contacts get user@example.com --json # Update contact resend contacts update user@example.com --unsubscribed --json # Delete contact resend contacts delete --yes --json # List contact's segments resend contacts segments user@example.com --json # Add contact to segment resend contacts add-segment user@example.com --segment-id --json # Remove from segment resend contacts remove-segment user@example.com --json # List contact's topic subscriptions resend contacts topics user@example.com --json # Update topic subscriptions resend contacts update-topics user@example.com \ --topics '[{"id":"topic-uuid","subscription":"opt_in"}]' --json ``` ### Segments ```bash # List segments resend segments list --json # Create segment resend segments create --name "Newsletter Subscribers" --json # Get segment resend segments get --json # Delete segment (no update endpoint — delete + recreate to rename) resend segments delete --yes --json ``` ### Broadcasts ```bash # Create draft resend broadcasts create \ --from hello@domain.com \ --subject "Weekly Update" \ --segment-id \ --html "

Hello {{{FIRST_NAME|there}}}

" --json # Create from HTML file resend broadcasts create --from hello@domain.com \ --subject "Launch" --segment-id --html-file ./email.html --json # Create + send immediately resend broadcasts create --from hello@domain.com \ --subject "Launch" --segment-id --html "

Hi

" --send --json # Create + schedule resend broadcasts create --from hello@domain.com \ --subject "News" --segment-id --text "Hello!" \ --send --scheduled-at "tomorrow at 9am ET" --json # Send existing draft resend broadcasts send --json # List broadcasts resend broadcasts list --json # Get broadcast details resend broadcasts get --json # Update draft resend broadcasts update --subject "Updated Subject" --json # Delete broadcast resend broadcasts delete --yes --json ``` Template variables in HTML: `{{{FIRST_NAME|Friend}}}` — triple-brace with optional fallback. ### Templates ```bash # List templates resend templates list --json # Create template with variables resend templates create --name "Welcome" \ --subject "Welcome!" \ --html "

Hello {{{NAME}}}

" \ --var NAME:string --json # Create with fallback resend templates create --name "Invoice" \ --subject "Invoice" \ --html "

Amount: {{{AMOUNT}}}

" \ --var AMOUNT:number:0 --json # Get template resend templates get --json # Update template resend templates update --subject "Updated Subject" --json # Publish draft → live resend templates publish --json # Duplicate template resend templates duplicate --json # Delete template resend templates delete --yes --json ``` Lifecycle: create (draft) → update → publish. Re-publish after updating a published template. ### Topics ```bash # List topics resend topics list --json # Create topic resend topics create --name "Product Updates" --json # Create with default opt-out resend topics create --name "Weekly Digest" --default-subscription opt_out --json # Get topic resend topics get --json # Update topic resend topics update --name "Security Alerts" --json # Delete topic resend topics delete --yes --json ``` ### Webhooks ```bash # List webhooks resend webhooks list --json # Create webhook (all events) resend webhooks create \ --endpoint https://app.example.com/hooks/resend \ --events all --json # Get webhook resend webhooks get --json # Update webhook resend webhooks update --status disabled --json # Delete webhook resend webhooks delete --yes --json # Listen locally (dev) resend webhooks listen --json ``` Event types (17): email.sent, email.delivered, email.delivery_delayed, email.bounced, email.complained, email.opened, email.clicked, email.failed, email.scheduled, email.suppressed, email.received, contact.created, contact.updated, contact.deleted, domain.created, domain.updated, domain.deleted. ### API Keys ```bash # List API keys resend api-keys list --json # Create full-access key resend api-keys create --name "Production" --json # Create domain-scoped sending key resend api-keys create --name "CI Token" \ --permission sending_access --domain-id --json # Delete key (immediate, irreversible) resend api-keys delete --yes --json ``` ### Utility ```bash # Doctor — check CLI version, API key, domains, AI agent detection resend doctor --json # Who am I resend whoami --json # Open dashboard in browser resend open # Auth — switch profile resend auth switch # Login (non-interactive) resend login --key re_xxx --json # Logout resend logout --json ``` ## Global Flags | Flag | Description | |------|-------------| | `--api-key ` | Override API key for this command | | `-p, --profile ` | Use specific profile | | `--json` | Force JSON output | | `-q, --quiet` | Suppress spinners (implies `--json`) | ## Agent Usage Rules 1. **Always use `--json` flag** — ensures structured output, no TTY prompts. 2. **All required flags must be provided** — no interactive prompts in non-TTY mode. 3. **Destructive actions need `--yes`** — deletes require confirmation bypass. 4. **Exit codes:** 0 = success, 1 = error. Errors include `message` + `code`. 5. **Batch limit:** 100 emails per `emails batch` request. 6. **Attachments not supported in batch sends.** 7. **`--scheduled-at` requires `--send` flag on broadcasts.** ## Error Codes | Code | Cause | |------|-------| | `auth_error` | No API key found | | `missing_body` | No --text/--html/--html-file | | `file_read_error` | Can't read file | | `send_error` | API rejected the send | | `missing_key` | Login without --key in non-interactive | | `validation_failed` | API rejected the key |