Hi. Using Zimbra for Linux, version 7.2.2 GA.

I connect to gmail with Zimbra. After reading an e-mail, I want to mark it so that it will be saved in gmail's "All Mail" folder rather than in Deleted. I generally keep every post in the All Mail archive. I can't find a way to do that. I've looked at the keyboard shortcuts, but can't find anything there to help. Can someone help? Thanks.