Official Gmail Blog: New in Labs: Got the wrong Bob?
"Got the wrong Bob?" is a new Labs feature aimed at sparing you this kind of embarrassment. Turn it on from the Labs tab under Gmail Settings, and based on the groups of people you email most often, Gmail will try to identify when you've accidentally included the wrong person — before it's too late.
Finally there is a new feature to help Gmail user (f.e. employees from a bank) to send stuff (trustful information like customer details) to the wrong person...
Check also the comment a few weeks ago.


