In offline mode of gmail, one can create email messages and send them even if you are offline. After the addition of new feature which allows attachments to be sent in the offline mode too, one doesn’t need to alter the way one used to send attachments. You can still send attachments the same way you used to , just attach them and send them along. It works the same in online or offline mode.

If offline feature is enabled, the mail goes through the outbox , regardless of whether you are online or offline. The new feature of Google enables attachments to be attached and sent in the same way as normal email messages in offline mode. The fact that gmail now uses outbox to send mails allows Gmail to capture all attachments, even if you suddenly get disconnected from network. If you’re online, your mail will quickly be sent along to its destination.

But you can’t send inline images in emails if using it in offline mode.

Steps to enable the offline mode feature of gmail

1. Visit the Labs tab page.

2. Select Enable next to Offline Gmail.

3. Click save changes. After the browser reloads there appears a small ” Offline ” link on the top right hand corner next to your username. Click this link to start the offline set up process.

4. After you click on the link the process of activating offline feature will begin and installation process will start.

5.  Also you need to install Gears to enable the offline feature of Gmail to run on your browser.

6. After that the browser will restart and you are ready to use the ‘offline’ gmail features including the offline attachment feature of it.