If you delete a user account then it will automatically disconnects mailbox from the account and adds to Disconnected Mailbox list. Continue reading Powershell Get Disconnected mailbox in Exchange Server
It is important to realize that mail is not sent directly to the host whose name follows the@ in the email address. Instead, that host name is first looked up using DNS to find the names of its MX (mail exchange) servers. To illustrate, consider the email address firstname.lastname@example.org. Before mail is sent to example.com, that host’s MX records are looked up:
example.com. MX 10 mail.example.com. example.com. MX 20 bob.fallback.host.