The function hierarchy

Incomplete hierachy of functions:

1. 1. create a message
      1. add new recipients to messages
      2. attach file
      3. delete draft
      4. save draft
      5. send a message
   2. view recipient addresses
   3. view sent messages
   4. view groups of recipients
   5. view all my drafts

Complete hierarchy of functions:

1. create a new user account
   
2. update user information
3. delete user account
4. create a message
   1. add new recipients to messages
   2. attach file
   3. delete draft
   4. save draft
   5. send a message
5. delete a message
6. file management
   1. create file
   2. delete file
   3. change existing file
7. view recipient addresses
8. view sent messages
9. view groups of recipients
10. view all my drafts