Email Addresses

Because we have multiple staff using MYOB I would like to set up the return email address to be that of the employee who sent the email, not the email address entered in Setup>Company Information.  

In Setup>Company Information the MYOB licensed user's email address is recorded.  When emails are sent to suppliers and customers the return email address is the one set up in Company Information and not that of the sender.

How do I record the email address to be that of the sender?  For example, the purchasing officer should have their individual email address set as the return address, not the Company Information email address.