Save emails that you send

Two things I would like to know and if these can not happen, would it be possible in the future to make changes.  

Can you attach a document to the emails you send.  I send emails to parents and staff throughout VBS week and sometimes I would have liked to have attached another document.

Is there a way to save the letters that I send on the digital library.  I usually copy and save it to my documents.  

Thank you for your help.