How to setup mail server as like Apple iCloud service did?

hello to all! Just start using DO and try to choose right mail server for me. I want to have simplicity configuration for mailbox aliases for email users as like iCloud does. For example, in my iCloud email account i has email aliases which i created and when i setup my mail clients (Apple Mail Client or iOS Mail App) i has ability to use any of email aliases which i want use for sending. Or another example is Microsoft Shared Mail Folder. When some user delegate his own email folder or even email address for someone in domain and this user can use this address for sending and receiving email. Like when some corporate email address like support@corp.com can be delegate to more than one person when support stuff use it for helping and supporting. So i am looking for functionality as i tried to describe above. Which mail server can work with this options?