Depend on request we can configure Send As, Send on Behalf and Full Access permission to mailbox on Exchange server. We can configure all this with GUI and Poweshell:
With the Powershell
Send on Behalf – This will grant Asim.Alili send on behalf permissions for Seymur.Guliyev
Set-Mailbox Seymur.Guliyev -GrantSendOnBehalfTo Asim.Alili
Send As – This will grant Asim send as permissions for Seymur.Guliyev
Add-ADPermission Seymur.Guliyev -ExtendedRights Send-As -user Asim.Alili
Full Mailbox Access – This will grant Asim, full access to Seymur.Guliyev’s Mailbox
Add-MailboxPermission -Identity Seymur.Guliyev -User Asim.Alili -AccessRights FullAccess -InheritanceType All
With the GUI
Open Exchange Admin Center, then browse to recipients, select needed user to grant the permission and click the to edit. we would like to grant Asim Alili the right to send as Seymur Guliyev so we select Seymur and choose edit.
Then go to the option mailbox delegation and add the user which you want add the permission to. we want to grant Asim Alili the right to send as Seymur Guliyev.
Same way we can set Send on Behalf and Full Access permission.
But i want note that on Exchange 2010 all these permission placed on different place. So you can reach the send as and full access permissions by right clicking the user in the Exchange Management Console under recipient configuration. Send on behalf permission you need to go the users properties, mail flow settings tab and delivery options.