SendGrid API Uptime & Email Delivery Monitoring

Why Monitor SendGrid Email Delivery?

Transactional emails (such as user signups, password resets, security alerts, and payment invoices) are the lifeblood of modern SaaS and e-commerce applications. If your email delivery pipeline fails, your users are locked out of their accounts, customer support requests skyrocket, and your conversion rates plummet.

SendGrid is a highly reliable email infrastructure provider, but transactional email delivery is not foolproof. Outages can occur silently across several failure points:

• API Authentication Failures: API tokens can be modified, deleted, or rotated incorrectly, causing your backend email dispatches to fail silently with unauthorized response codes.
• DNS Record Deletion: Verification records (specifically SPF, DKIM, and MX records) can be accidentally overwritten or deleted during DNS migration tasks. This causes inbox providers like Gmail and Outlook to immediately reject your transactional emails or route them to spam folders.
• Webhook Handler Crashes: If you rely on SendGrid's Event Webhook to track delivery states, bounces, or spam reports, a crash in your webhook handler will block database updates, leaving your platform blind to delivery errors.

Active email monitoring guarantees that you are notified the moment your email delivery systems fail, allowing you to fix the underlying API, DNS, or server credentials before it impacts your brand reputation.

🛠️ Step-by-Step Guide to Monitor SendGrid

Setting up comprehensive monitoring for SendGrid involves verifying API availability, email delivery latency, and DNS integrity.

1. Monitor SendGrid API Endpoint Availability

Configure HTTP uptime checks targeting SendGrid's primary REST API endpoint (https://api.sendgrid.com/v3/).

• Uptime Check Setup: Create an HTTPS check in your Pingzo dashboard targeting the API host.
• Response Assertions: Confirm that the API responds with a standard payload and validates the SSL certificate trust chain.
• Alert Routing: Route downtime warnings directly to your team's instant channels (such as WhatsApp or Telegram) so you are notified within seconds of an API block.

2. Monitor SendGrid Event Webhook Handler

If your application processes real-time delivery notifications, you must monitor the endpoint that receives payloads from SendGrid (e.g. /api/webhooks/sendgrid):

• Payload Validation: Set up an active monitor targeting your webhook URL.
• Verification: Ensure your webhook handler responds with 200 OK status within a 2-second timeout window.
• Overage Alerts: Set up database alert queries to verify that webhook payload delivery volume matches expected hourly baselines.

3. Automate SPF and DKIM DNS Records Tracking

Because email deliverability depends entirely on your domain authority settings, you should track your authentication records:

• Configure standard DNS checks in Pingzo targeting your verified sending domain.
• Monitor key TXT records containing your SPF and DKIM public keys (e.g., em123.yourdomain.com).
• Set up alerts to trigger if the record values are modified, deleted, or fail to resolve.

📋 SendGrid Monitoring Checklist

💡 Frequently Asked Questions

How do you monitor SendGrid API availability?

To monitor the API, configure external HTTPS checks targeting api.sendgrid.com. Ensure the check validates the SSL trust chain and alerts your team if response latency exceeds your defined SLA targets.

Why should I monitor SendGrid DNS records?

Inbox providers use SPF and DKIM records to verify that incoming emails are authorized by the domain owner. If these DNS records are altered or deleted, your email deliverability score will drop, and your emails will be routed to spam folders or blocked completely.

Can I monitor SendGrid SMTP server connection times?

Yes. You can configure TCP checks targeting SendGrid's SMTP ports (such as port 587 or 465) to measure connection handshake speeds and ensure the mail gateway is responsive.