Don’t Save Mail Drafts to Gmail Server
Ivan Drucker (via Clark Goble):
But if you really want synchronized Drafts, and you want the folder to behave correctly, you can go to your Gmail settings and under “Forwarding and POP/IMAP”, turn Auto-Expunge Off, and in the following section choose “Immediately Delete The Message Forever”. If you choose this setting, you must turn off Archive Messages on any iOS devices (see my previous post on this) or you will lose a message forever when you tap the Archive icon.