Marketing emails not sending due to unexpected SMTP configuration errors

max_810
Wed, 18 Jun 2025 14:22:00 +0000

Quick diagnostic - go to your Email Settings > Domains and click “Test DNS” button. This will show you exactly what HubSpot sees when querying your DNS records. In my experience, about 40% of DKIM issues are actually propagation delays, but the other 60% are configuration mismatches between what HubSpot expects and what’s actually in DNS. Check if you have multiple DKIM selectors configured - sometimes old records conflict with new ones.