Same issue, another symptom. Using Apple Mail 8.2 and OS X 10.10.2. Our schools is using Google enterprise and Apple Mail as client.
I started a new mail to a Colleague A - it automatically saves into drafts. I did not finish it and I did not send it. During the time the message sits in Drafts, Colleague A sent me an unrelated email. Result:
- Apple mail combines my draft message with the raw code of email from Colleague A
- the combined mail appears in my Inbox with me as a Sender and Colleague A as a recipient
- Apple Mail acts as if Colleague A never sent a message even though online Gmail and all other mail clients display this correctly (Airmail 2, Sparrow, Postbox, etc.)
- And on a serious security note—if he adds an attachment of a config profile for access to our networks (example), the raw code shows all details of the config profile (network name, network password, etc.)
It is a mess.