What is a webhook? A Clear Guide

A webhook is an HTTP callback your app receives when an event happens (delivered, bounced, opened), so you can react in real time.

Why it matters

Knowing a webhook helps you build reliable sending. See the email API quickstart.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, a REST API, and an AI watching deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.