sendgrid-webhooks
Receive and verify SendGrid webhooks. Use when setting up SendGrid webhook handlers, debugging signature verification, or handling email delivery events.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/hookdeck/webhook-skills --skill sendgrid-webhooks- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads sendgrid-webhooks automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
SendGrid Webhooks
When to Use This Skill
- Setting up SendGrid webhook handlers for email delivery tracking
- Debugging ECDSA signature verification failures
- Processing email events (bounce, delivered, open, click, spam report)
- Implementing email engagement analytics
Essential Code
Signature Verification (Manual)
SendGrid uses ECDSA (Elliptic Curve Digital Signature Algorithm) with public key verification.
// Node.js manual verification
const crypto = require('crypto');
function verifySignature(publicKey, payload, signature, timestamp) {
// Decode the base64 signature
const decodedSignature = Buffer.from(signature, 'base64');
// Create the signed content
const signedContent = timestamp + payload;
// Create verifier
const verifier = crypto.createVerify('sha256');
verifier.update(signedContent);
// Add PEM headers if not present
let pemKey = publicKey;
if (!pemKey.includes('BEGIN PUBLIC KEY')) {
pemKey = `-----BEGIN PUBLIC KEY-----\n${publicKey}\n-----END PUBLIC KEY-----`;
}
// Verify the signature
return verifier.verify(pemKey, decodedSignature);
}
// Express middleware
app.post('/webhooks/sendgrid', express.raw({ type: 'application/json' }), (req, res) => {
const signature = req.get('X-Twilio-Email-Event-Webhook-Signature');
const timestamp = req.get('X-Twilio-Email-Event-Webhook-Timestamp');
if (!signature || !timestamp) {
return res.status(400).send('Missing signature headers');
}
const publicKey = process.env.SENDGRID_WEBHOOK_VERIFICATION_KEY;
const payload = req.body.toString();
if (!verifySignature(publicKey, payload, signature, timestamp)) {
return res.status(400).send('Invalid signature');
}
// Process events
const events = JSON.parse(payload);
console.log(`Received ${events.length} events`);
res.sendStatus(200);
});
Using SendGrid SDK
const { EventWebhook } = require('@sendgrid/eventwebhook');
const verifyWebhook = new EventWebhook();
const publicKey = process.env.SENDGRID_WEBHOOK_VERIFICATION_KEY;
app.post('/webhooks/sendgrid', express.raw({ type: 'application/json' }), (req, res) => {
const signature = req.get('X-Twilio-Email-Event-Webhook-Signature');
const timestamp = req.get('X-Twilio-Email-Event-Webhook-Timestamp');
const isValid = verifyWebhook.verifySignature(
publicKey,
req.body,
signature,
timestamp
);
if (!isValid) {
return res.status(400).send('Invalid signature');
}
// Process webhook
res.sendStatus(200);
});
Common Event Types
| Event | Description | Use Cases |
|---|---|---|
processed | Message has been received and is ready to be delivered | Track email processing |
delivered | Message successfully delivered to recipient | Delivery confirmation |
bounce | Message permanently rejected (includes type='blocked' for blocked messages) | Update contact lists, handle failures |
deferred | Temporary delivery failure | Monitor delays |
open | Recipient opened the email | Engagement tracking |
click | Recipient clicked a link | Link tracking, CTR analysis |
spam report | Email marked as spam | List hygiene, sender reputation |
unsubscribe | Recipient unsubscribed | Update subscription status |
group unsubscribe | Recipient unsubscribed from a group | Update group subscription preferences |
group resubscribe | Recipient resubscribed to a group | Update group subscription preferences |
Environment Variables
# Your SendGrid webhook verification key (public key)
SENDGRID_WEBHOOK_VERIFICATION_KEY="MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE..."
Local Development
For local webhook testing, use Hookdeck CLI:
npx hookdeck-cli listen 3000 sendgrid --path /webhooks/sendgrid
No account required. Provides local tunnel + web UI for inspecting requests.
Resources
- overview.md - What SendGrid webhooks are, common event types
- setup.md - Configure webhooks in SendGrid dashboard, get verification key
- verification.md - ECDSA signature verification details and gotchas
- examples/ - Complete implementations for Express, Next.js, and FastAPI
Related Skills
webhook-handler-patterns- Cross-cutting patterns (idempotency, retries, framework guides)- hookdeck-event-gateway - Webhook infrastructure that replaces your queue — guaranteed delivery, automatic retries, replay, rate limiting, and observability for your webhook handlers
FAQ
What does the sendgrid-webhooks skill do?
Receive and verify SendGrid webhooks. Use when setting up SendGrid webhook handlers, debugging signature verification, or handling email delivery events.
How do I install sendgrid-webhooks?
Run npx skills add https://github.com/hookdeck/webhook-skills --skill sendgrid-webhooks in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/sendgrid-webhooks/ (personal) or .claude/skills/sendgrid-webhooks/ (project).
Which AI agents can use sendgrid-webhooks?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is sendgrid-webhooks safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains sendgrid-webhooks?
It is published by hookdeck in hookdeck/webhook-skills. It has 253 recorded installs.
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