Add direct-mail opt-outs to suppression list and log

Your direct-mail opt-out submissions aren't recorded, causing campaigns to mail opted-out recipients. They are added to suppression and logged so mail ops can stop outreach before the next send.

Overview

When opt-outs don't flow into your suppression systems, campaigns risk mailing people who asked out and wasting production. This workflow captures external opt-out submissions, logs them for audit, and pushes addresses into the suppression platform so mail ops can stop postal sends before the next campaign.