Sorted:

Configuring Zoho Mail with Sorb SCES

Zimbra Retraction Integration Guide

Gmail blocks some emails because of the attachment file types

Google Workspace / Gmail Retraction Integration Guide

Configuring Zimbra with Sorb SCES

Configuring Microsoft O365 with Sorb SCES

SorbSecurity Cloud Connection Details

Configuring Google Workspace (G-Suite) with Sorb SCES

SorbSecurity Support Services Program

How to contact Sorb Support