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Engineering / ENG-1387

notifier: stop mailing addresses that hard-bounce

Project: Engineering
Type: Task
Status: Done Done
Priority: Medium
Reporter: Piet de Vries <piet.devries@acme-hq.example>
Assignee: Piet de Vries <piet.devries@acme-hq.example>
Labels: None
Components: notifierportal
Fix versions: notifier 2026.04.24portal 4.0
Sprint: Sprint 40
Created: 16 Apr 2026, 07:15 UTC
Updated: 24 Apr 2026, 14:40 UTC
Resolved: 24 Apr 2026, 14:40 UTC

Description

Mailcrest posts bounces to a webhook. We ignore them and keep mailing dead addresses, which hurts our sending reputation (OPS-29: a receiving server deferred us for 3 hours).

Store hard bounces per address; stop sending to it.
Show "Email bouncing" on the person in the portal so an administrator can fix the address.
Soft bounces: retry as now.

Linked issues

relates to OPS-29 Notices to Almwerk delayed 3 hours (their mail server deferred us) Done

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