How to Manually Block an Email Address or Domain

Here is a direct link to the area where you can block emails:

https://gu.login-usb.mimecast.com/m/portal/app/#/advanced/blocked

You can permit or remove addresses you have already blocked or “Add Blocked.”

Note: Unless you wish to block an entire company or organization, it is not recommended to block the domain.

Here is a direct link to the area where you can permit emails:

https://gu.login-usb.mimecast.com/m/portal/app/#/advanced/permitted

Note: Please be mindful when blocking or permitting to select the email address vs the whole domain. Blocking the domain will prevent all emails from any address at that domain from being delivered.