Setup [patched] | Zix Office 365

Ensure your transport rules have an "Except if" clause to prevent emails already processed by Zix from being sent back to Zix.

Double-check that your certificates are valid and that TLS 1.2 or higher is enabled. zix office 365 setup

Name the connector (e.g., "Outbound to Zix") and ensure "Turn it on" is checked. Ensure your transport rules have an "Except if"