Identification of user roles and system functions

1.User roles:
~~-Administrator~~
-User

2.System functions:
-~~Loging~~Create ina message
-Send a message
-Add new recipients to ~~the system~~
~~-Creating~~ messages
-~~Writing~~Attach files to messages
-~~Reading~~Delete drafts
-Save drafts
-View recipients addresses
-View sended messages
-~~Saving draft~~
~~-Delete draft~~
~~-Replaying to messeges~~
~~-Creating~~View groups of recipients
-~~Viewing~~View ~~old~~all my drafts
~~-Sending messages~~
~~-Receiving messages~~
~~-Viewing drafts history~~
~~-Viewing messages history~~
~~-Sending a raport with summary~~