Using Exchange Online exclusively, is it possible to change or specify a value for a header? For example:

X-MS-Exchange-Organization-Original-Sender
or
X-MS-Exchange-Organization-AuthAs

In fact, the objective is to see who actually sent a message through a shared box or a distribution list.

​ Using Exchange Online exclusively, is it possible to change or specify a value for a header? For example: X-MS-Exchange-Organization-Original-SenderorX-MS-Exchange-Organization-AuthAs In fact, the objective is to see who actually sent a message through a shared box or a distribution list.  Read More

​