# Deliverability horror stories (and what you learned)
Canonical: https://sendstudio.io/posts/deliverability-horror-stories

Misery loves company. Share your worst deliverability disaster and the lesson. I'll start: a client sending marketing from their root domain...

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.


## Comments
> Cold domain, full-volume launch day. Classic. We learned to warm up gradually starting with engaged users. Painful week.

> Mine was emailing a list I hadn't touched in a year. Spam complaints through the roof. Now we sunset unengaged contacts religiously.

> Reminder that none of this is about how good the email looks. We make gorgeous AI emails in Brew and STILL had to get the auth + hygiene right separately. Two different jobs.