Gmail Delegation is exactly what it sounds like it's for: pawning your correspondence obligations off on someone else. While opening multiple doors to your e-mail account sounds a tad sketch, in a professional environment this could come in quite handy. 

Gmail delegation grants another Google account holder access to your e-mail account, allowing them to both send and receive messages on your behalf. When a message is sent using the feature, it will appear to the receiver as being from your address, but will note the actual sender:

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These e-mail account "guests" won't be able to chat on your behalf, change your password or settings--they're simply e-mail monkeys.

To begin granting access, hit up the Settings link in the top right corner of Gmail. On the "Accounts" tab, there will be a new section where you can select "Grant access to your account." 

"The account you add will get a verification e-mail with links to accept or deny access," noted Google software engineer Hari Nidumolu in the official outplacement. "Once the account accepts, a small down arrow will appear beside the e-mail address at the top right corner of Gmail which can be used to toggle between accounts." 

It's in the Details

This feature has been available to Google Apps account holders for some time. Though general release supports the idea that "regular" people also need to have their e-mail managed by someone else, aside from those with assistants it's hard to think of any other type of consumer that would be comfortable with it. 

Still, it's another piece of Google's case against Microsoft, and everyone could use a bit more e-mail management in their lives. As Gmail becomes more robust and corporate-friendly, perhaps it will be little details like these that ultimately convince Microsoft users to cave and join the G-side.