Send mailbox expiry notices to affected clients now

Your mailbox expirations go uncommunicated, leaving client mail unclaimed and operations scrambling to resolve renewals. Send expiry notices so billing and support recover renewals before cancellation.

Overview

Mailbox expirations often trigger reactive manual work and lost renewals when clients aren't notified. This flow turns an incoming webhook into a branded expiry email within minutes so billing and support can recover renewals ahead of cancellation and cut manual follow-up.