Did you hit Send too quickly? Whether it’s an embarrassing mistake or you simply forgot to Reply All, the Undo Send lab can help you take back your email before it’s too late.
Here’s how it works – Undo Send delays the sending of your email for up to thirty seconds and displays an Undo link at the top of your email until it’s actually sent. Clicking Undo will change the message back into a draft. Since you can’t truly take back an email once it goes out, this is a clever workaround!
If you’d like to use this feature, enable Undo Send in your Labs right away so it’s available when you need it. Instructions are available at http://support.google.com/mail/bin/answer.py?hl=en&answer=1284885
Reminder: Disabling Labs
Labs are experimental features and, in certain cases, can cause problems on certain browsers or in certain combinations (although many of us use labs all the time and have never experienced problems). If you are having difficulty viewing your email and suspect it might have to do with a lab you enabled, you can access a labs-free view of your email by visiting https://mail.google.com/a/brown.edu/?labs=0. Once you log in, you can go to your settings and disable whichever labs you suspect might be causing a problem, then log back in at http://gmail.brown.edu.