Email Glossary

Email Webhook

An email webhook is an HTTP POST request sent by an email service provider to your application's endpoint when email events occur. Events include delivery, bounce, complaint, open, click, and unsubscribe. Webhooks enable real-time reaction to email events without polling.

Common Webhook Events

  • ●email.delivered - Email was accepted by the receiving server
  • ●email.bounced - Email was rejected (hard or soft bounce)
  • ●email.complained - Recipient marked email as spam
  • ●email.opened - Recipient opened the email (tracking pixel loaded)
  • ●email.clicked - Recipient clicked a tracked link
  • ●email.unsubscribed - Recipient clicked the unsubscribe link

Each event includes the message ID, timestamp, and event-specific data like bounce reason or clicked URL.

Related Terms

Email API

A programmatic interface for sending, receiving, and managing emails from your application code.

Bounce Rate

The percentage of sent emails that couldn't be delivered to the recipient.

Complaint Rate

The percentage of recipients who mark your email as spam, a critical reputation metric.

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