Postmark Emails Going to Spam: Diagnosis & Fixes for Postmark Senders
Your Postmark transactional or marketing emails are landing in spam
Fix within 24 hours.
Check your Postmark configuration:
In Postmark, verify your sending domain is added and confirmed
Check DKIM and SPF are configured correctly
Review Postmark bounce and spam complaint metrics
What Could Be Causing This?
Postmark Domain Not Fully Verified
Most CommonPostmark requires full domain verification with DKIM and SPF.
How to confirm:
In Postmark, check if domain shows all verification checks as passed.
Fix Playbook
Step 1: Fully Verify Your Domain in Postmark
- In Postmark, add your sending domain
- Complete DKIM configuration
- Add SPF record
- Verify Return-Path CNAME (Postmark specific)
- All checks must pass for reliable delivery
Postmark-Specific Note:
Postmark requires Return-Path CNAME setup — this is not needed by other ESPs but critical for Postmark.
Prevention Checklist
- Keep Postmark domain fully verified
- Monitor bounce and spam complaint rates
Free Diagnostic Tools
Stop Fixing Deliverability Issues Reactively
The problem you just fixed probably cost you 20-30% of revenue while it was happening. InboxEagle would have detected it within 2 minutes and alerted you before placement dropped.
Real-time monitoring, AI diagnosis, and 24/7 alerts for every reputation change.
Start 14-Day Free Trial — No Card Needed