Mimecast Permit Sender
Managed senders can be used to block entire domains yet allow specific users from the same domain name. For example, a user can add "domain.com" to their Personal locked Sender list, but then add user1@domain.com and user2@domain.com to their Permitted Sender list. In this scenario, the permitted list overrides the blocked list, and users 1 and 2 will be able to email the user while user3@domain.com and others will not.
