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. view recipient addresses
7. view sent messages
8. view groups of recipients
9. view all my drafts