This is not the first time that Google has introduced a feature to protect individuals from themselves. Have you ever been in a situation where you send an email message and immediately realize it was a mistake Where you accidentally sent something to the wrong recipient or simply regret writing that message or forgot to attach the file etc.,? If yes, then Google has unveiled a solution for you. The new “Undo Send” feature in Gmail. Gmail has added an "Undo Send" feature which can recall messages that you send. It should be within five seconds after clicking on the Send button.
"This feature can't pull back an email that's already gone; it just holds your message for five seconds so you have a chance to hit the panic button. And don't worry - if you close Gmail or your browser crashes in those few seconds, we'll still send your message," said Michael Leggett, Gmail user experience designer, in the Gmail Blog.
To activate Undo Send, go to the Settings/Labs tab in Gmail, enable it, and you're set. Once it is active you will see a new undo link on every sent email confirmation, which gives users a quick five second window (with an option to increase this to 10 seconds) to take the message back into the Gmail editor.

"This feature can't pull back an email that's already gone; it just holds your message for five seconds so you have a chance to hit the panic button. And don't worry - if you close Gmail or your browser crashes in those few seconds, we'll still send your message," said Michael Leggett, Gmail user experience designer, in the Gmail Blog.
To activate Undo Send, go to the Settings/Labs tab in Gmail, enable it, and you're set. Once it is active you will see a new undo link on every sent email confirmation, which gives users a quick five second window (with an option to increase this to 10 seconds) to take the message back into the Gmail editor.

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Google posted on its support page that, "We're aware of a problem with Gmail affecting a number of users. This problem occurred at approximately 1.30 a.m. Pacific Time. We're working hard to resolve this problem and will post updates as we have them. We apologize for any inconvenience that this has caused,".



First one is by using a service called
The second option is by using
The third and the final option is by using 

Once you enable offline Gmail, Google Gears downloads a cache of your mail; then, when ever you have a limited or no connectivity, Gmail can switch to offline mode. You can send and receive messages (which will be saved in your outbox and then will be sent when Gmail detects a connection) and also use other Gmail features as if you're online.