Marketing emails not sending due to unexpected SMTP configuration errors

nancy_lead
Wed, 18 Jun 2025 10:47:00 +0000

I’ve seen this before - DKIM propagation can take longer than expected, especially if you have multiple DNS servers. First thing to check: are you using the exact CNAME records HubSpot provided? Sometimes copy-paste errors add extra spaces or characters that break validation. Also verify your TTL settings aren’t set too high (should be 3600 or less for faster propagation).