Emails are not saved in Sent or Drafts

I think these Threads are linked:

I still do have this Issue, which in special annoying when sharing an Mail Account with another Person, that can not keep track of the Mails I did sent from my SFOS phone. As I can not change the Config on the server side, is there any Idea what could be done on the client/SFOS side? Maybe @dcaliste has some Idea?