What is one of the necessary steps for Routing Emails Outbound with Mimecast?

Configuring the firewall for Mimecast access is a crucial step for ensuring that outbound emails can be routed effectively through the Mimecast service. This process involves updating firewall rules to allow SMTP traffic to and from Mimecast’s IP addresses, which facilitates secure communication between your organization’s mail server and Mimecast’s platform.

When the firewall is properly configured, it permits outgoing email traffic to flow through Mimecast for processes such as email filtering, archiving, and security scanning, thus ensuring that legitimate email can be sent without interruptions. This setup is essential for maintaining a smooth workflow and protecting against potential threats.

In contrast, other options like setting up a VPN, using a separate email server, or installing additional software on user devices may not directly relate to the fundamental requirement of ensuring that Mimecast has the necessary access to route emails. A VPN can enhance security but is not specifically required for email routing with Mimecast, while a separate email server could complicate the setup. Additionally, installing extra software on user devices is not a standard step for configuring outbound email routing through Mimecast.