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User Truck, the secretary, uses mailbox James Bond, the Manager, to send messages to customers.
Add-ADPermission -Identity "James Bond" -User Truck -AccessRights ExtendedRight -ExtendedRights "Send AS"
Truck Wells user opens its own outlook and creates a new message with FROM: James Bond@east.com TO: Rob.Prince@east.com.
Rob Prince will see the message coming from James Bond.

To remove the Send As permission from James Bond mailbox;
Remove-ADPermission -Identity "James Bond" -User "Truck" -ExtendedRights "Send As"
When you define a send connector with smart host, the user must be granted the send as permission. Usually, you assign the user to the Exchange Servers universal group. The group has the Send As permission.

Set-Mailbox -Identity "Mitch" -GrantSendOnBehalfTo "Michelle"
From outlook, open Mitch’s profile:

Click on the Permissions… button:

Outlook delegation can control individual folder access.
Michelle Rogers opens her mailbox and sends a message to Obama Lily.

When Obama Lily opens the message,

But Michelle cannot open Mitch’s mailbox folders.

If Mitch Rogers wants Michelle Rogers to open his inbox, he could delegate the permission to her.
When administrator grants Full Access permission to Sam Aston on Jim Flether's mailbox, Sam Aston can open and read the contents of Jim Flether's mailbox. But Sam Aston cannot send mail as Jim Flether.
Add-MailboxPermission "Jim Flether" -User "Sam Aston" -AccessRights FullAccess
Sam Aston logs on to his computer and opens its outlook:


When you grant a user Receive As permission to a mailbox database, that user can log on to all mailboxes within that database, but is not able to send e-mail messages from those mailboxes. Also, if you grant Receive As permission at the storage group level, the specified user can log on to all mailboxes within all databases in the storage group.
Get-MailboxDatabase | FL Name, StorageGroup
Name : Mailbox Database
StorageGroup : EX20071\First Storage Group
Name : Mailbox Database
StorageGroup : EX20072\First Storage Group
Name : House
StorageGroup : EX20071\First Storage Group
Name : Newton
StorageGroup : EX20071\First Storage Group
Name : Issac
StorageGroup : EX20071\First Storage Group

Add-ADPermission -Identity "House" -User "George.Allistair" -ExtendedRights Receive-As
George Allistair logs on to his XP workstation and opens his outlook.
He can open all mailboxes in his database.

Similarly,
Add-ADPermission -identity "First Storage Group" -User "Mary Will" -ExtendedRights Receive-As
Mary Will logs on to her workstation and opens the outlook.
She can open any mailbox hosted under First Storage Group.