If you are using Microsoft Office 365 to host your mailboxes, it is recommended you follow these steps to to ensure that your organizations instance of Cloud Email Security is not throttled or blocked by Microsoft. In the Exchange admin center (EAC) ...

*** UPDATED G SUITE GUIDE *** https://www.cisco.com/c/en/us/support/docs/security/cloud-email-security/214736-configuring-g-suite-gmail-with-cisco-c.html   Additional help/clarity... for further instructions refer for the Google/G Suite site: https:...

In order to ensure that the dedicated IPs assigned to your Cloud Email Security instance are not throttled by Microsoft, you are required to add the IPs to the Allow List in the Exchange Administration Center (EAC). In the Exchange admin center (EAC)...

https://www.cisco.com/c/en/us/support/docs/security/cloud-email-security/214736-configuring-g-suite-gmail-with-cisco-c.html