imple mail v/s Email Fax functionality in message output determination

Can someone tell me what is the difference between simple mail functionality v/s email fax functionality in output determination ...

i have a reqmt from client as follows

1. A document neeeds to be sent to multiple email addresses and multiple faxes.

also the document that we sending thru mail /fax shud be stored in oyr SAP system for records .

Distribution lists is an option , but can i also use this functionality to send document via faxes ..but distribution list can only be set up for simple mail functionality ..

Second , i donthave an option of maintaining group email id in master eg vendor master as , this functionality if sending the Agency Business documnet (ABD) to multiple email address is only for ABD ...

However other documents like PO will be required to be sent to only someone in specific...

Regards ,

Madhavi solanki