Warning The Send on Behalf Of option, which can be set by a user in an Outlook client or by an administrator
on the Delivery Options property page, is quite different from the Send As option, which you can set
on the Security property page for a user. Send on Behalf Of lets a user send a message for another
user while also identifying the actual sending user. Send As lets the user of one mailbox send a
message as though it came from another mailbox, without any hint that the other mailbox didnt send
the message itself. If you worry about users sending embarrassing messages that look like they came
from another user, then Send on Behalf Of is a far safer option than Send As. If both options are
granted to a user, Send As will override Send on Behalf Of.