In order to change the From or Reply-To drop-downs to be someone other than you, a SPoC must update your user rights.
- Administration > Users
- Open User to send who can send on behalf of someone else
- Open the "Delegate of" Tab
- Add the specific Contact they can send on behalf of
Changing the From or Reply To
Launch the New Message Tool and prepare your Message as normal, then:
- Select the Contact in the "From" drop-down, and
- Select the Contact in the "Reply To" drop-down
Send your Message as normal.