Permissions to Manage Mailbox Servers

So here is the command that you use to add mailbox permissions:


Add-MailboxPermission -Identity "Some User" -User fawad -Accessright Fullaccess -InheritanceType all

Here are some more parameters for -Accessright, which is actually the most important part of the command that can be used to control the permission:

FullAccess
DeleteItem
ReadPermission
ChangePermission
ChangeOwner
ExternalAccount
SendAs

MS Reference article: Answer Available Here