A webhook is an automated HTTP request that one application sends to a URL you define whenever a specific event occurs — a real-time "push" notification, rather than something you have to poll for. In email, webhooks report events like deliveries, opens, clicks, bounces, and unsubscribes to your own systems as they happen.
How webhooks work
You register a URL with the sending platform; when an event fires, the platform sends a small payload to that URL, and your app reacts — updating a CRM, triggering a workflow, or logging the event. They pair naturally with an API and an SMTP relay for transactional email. See how APIs work with Mailpro's SMTP sending server.
Why it matters
Webhooks let you build automations that react instantly to email activity without constant polling, keeping data in sync across your stack. Related: API and SMTP.
Mailpro and SMTP
React to email events in real time
Send through Mailpro's authenticated SMTP and API, with event data you can wire into your own systems.