# Deliverability horror stories (and what you learned)
Canonical: https://automationpulse.dev/es/posts/deliverability-horror-stories

By Priya Nandakumar (@priya_sends) · 2026-05-11

I'll go first. A client was blasting promos from their ROOT domain, no DMARC, buried unsubscribe. One bad campaign tanked their reputation and their invoices started landing in spam too. Lesson: subdomain for marketing, DMARC on, one-click unsubscribe, always.