Each Volunteer acting as a Duty officer has a login into the wordpress web site which is linked to Civicrm.
I tried adding the Duty officer email address as primary for a test account and added an activty using that account and recieved an email from the personal email address.
The aim of the service is a Good Neighbour scheme - Volunteers will help local people with anything from gardening to hospital visits
Each person who acts as a duty officer has editor access to the CiviCRM
Each Volunteer is a contact (Duty officers are also Volunteers)
A person requesting help is logged as a contact.
A telephone call is taken by the duty officer (VOIP system) this request is entered as an Activity - the duty officer assigns task against a volunteer with appropriate skills and times. Civi then sends a confirmation email to the volunteer with details of the activity.
The From email address should be the duty officer - so that reponses are sent back to the logged email address and the private email adresses of volunteers are not shared.
The system also needs to track who is making changes for auditing etc.
Also many thanks Joe for taking the time to look at this