Looking for a self hosted email server that supports notification via webhook

Hi guys. I'm trying to automate some of my workflow but unfortunately some old school services still use email for verification code. I'm looking for a self hosted email server that I can use to receive these verification emails, and notify a webhook when a new email arrives. Any suggestion? Thanks!

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I know I can use IMAP to get emails from, e.g., Gmail, but in my experiment it always has some unpredictable latency and not always reliable.