SPF, DKIM, sender reputation, and the Growthzi outbox log. Walk through the 4 usual causes and confirm your setup with a test send.
What you'll build
A working diagnosis flow for the moment a customer says they never got your email. You end up knowing the 4 usual causes (SPF/DKIM missing, sender reputation, spam-trigger content, wrong recipient address), which one applies, and the one fix per cause. You also come away with a test-send workflow you can run before every new campaign.
How Growthzi does it
Every Growthzi tenant ships with a shared sending domain by default, or you can connect your own with SPF, DKIM, and DMARC records. The Outbox log tracks every send with delivery status, bounce reason, and open events pulled from the ESP. When a send fails, the log names the exact cause so you fix at the source instead of guessing.
Step by step
- Open the CRM, go to Communication, then Outbox
- Find the failed send and read the bounce reason column
- If it is auth-related, verify SPF and DKIM at your DNS host
- If it is reputation-related, warm the sending domain with lower daily volume
- If it is content-related, remove trigger words and test with a personal Gmail
- Send a test to a Gmail and a Microsoft address before your next real campaign
