I'm not sure I could resist the temptation to do some serious trolling if I discovered a bug that let me send legit looking mail as @google.com users. Just imagine emailing allusers@google.com instituting a policy of riding a unicycle to work. It would be glorious.
Subject: A quick update on Sundar
foodback-atl was the equivalent of that, for one brief, shining moment. It started a classic reply-all barrage.
After you send an email as Sundar to jeff@amazon.com with an invite for a coffee and donuts at a Google office of his choice.
Unfortunately all the company-wide aliases have someone who has to approve each message.