My 2 Cents:  Now this is the funniest feature that I have ever seen created for any type of application much less your mail client.  You got “Don’t DRINK & DIAL” and it seem that these days it “Don’t DRINK and MAIL”

I wonder how many of you will be using this feature :O)
you know who you are …

We can’t say this is the most appropriate use for this kind of concept, but Google’s Gmail Labs has just introduced a new Gmail feature that is pretty funny to say the least. Dubbed “Mail Goggles”, the new service allows users to avoid sending late-night emails that they likely would think twice about sending if they were, well, sober. Mail Goggles can be enabled on the Labs tab within the Gmail settings menu and can be configured to activate during any time period the user desires, and on any number of days (configuration is done on the General settings tab).

During the active period, Mail Goggles will simply add an extra step to the email sending process – users must correctly solve a series of simple math problems before the email is sent out into cyberspace. The difficulty of the problems can be configured from 1 (easiest) to 5 (most difficult) and the user has 60 seconds to solve all five problems and click Send. If time expires before send is clicked, new problems are displayed and the timer starts over. Are you thinking what we’re thinking? This little add-on is likely going to result in more smashed keyboards than drunken emails prevented.

Of course if drunky is determined enough, he/she can simply hit the Labs tab and disable the service. Why not add another set of problems that must be solved before the add-on can be disabled? Mail Goggles is a very creative little Gmail enhancement but we think there are definitely more useful add-ons in Gmail Labs such as the oops I forgot to attach the attachment I mentioned in my email notifier. More useful applications of the Mail Goggles concept might be SMS goggles, mobile voice call goggles and iron underwear goggles.

Sometimes I send messages I shouldn’t send. Like the time I told that girl I had a crush on her over text message. Or the time I sent that late night email to my ex-girlfriend that we should get back together. Gmail can’t always prevent you from sending messages you might later regret, but today we’re launching a new Labs feature I wrote called Mail Goggles which may help.

When you enable Mail Goggles, it will check that you’re really sure you want to send that late night Friday email. And what better way to check than by making you solve a few simple math problems after you click send to verify you’re in the right state of mind?

By default, Mail Goggles is only active late night on the weekend as that is the time you’re most likely to need it. Once enabled, you can adjust when it’s active in the General settings.

Hopefully Mail Goggles will prevent many of you out there from sending messages you wish you hadn’t. Like that late night memo — I mean mission statement — to the entire firm.

Official Gmail Blog: New in Labs: Stop sending mail you later regret