Newsletter landing in spam
When open rates collapse, people rewrite subject lines first. Just as often Gmail/Outlook do not trust the domain: missing auth, complaints, cold lists.
What you can check
- Is the sending domain set up with SPF/DKIM/DMARC?
- Do marketing and day-to-day mail share a domain — and break each other?
- One-click unsubscribe and low spam complaints?
- Dead addresses still on the list?
Free domain check
Seed inbox tests and warm-up are separate tools. SpamAmpel covers authentication basics.