Sorted:

Zimbra fails to send outbound emails via SCES

Sorb sending limits in SorbSecurity Cloud Email Security(SCES)

Configuring Zoho Mail with Sorb SCES

Zimbra Retraction Integration Guide

Gmail blocks some emails because of the attachment file types

How to configure Timezone on SCES

Google Workspace / Gmail Retraction Integration Guide

Sandbox API Integration Examples

Configuring Zimbra with Sorb SCES

SorbSecurity Cloud URLProtect API Reference