At the bottom, click Advanced. Users can write, search, delete, and archive messages even when they have no connectivity to the Network, all changes are synchronized with the online service when you restore the Internet connection.
Offline users are limited to storage space available to Chrome, which Google said is usually only a fraction of the total free space on a drive.
You can then play around with the settings of the feature, changing whether to keep offline data on your device. Today, Google has started deploying the new Gmail's "Nudge" feature, which is created to help you reply to emails you missed or ignored like the lazy procrastinator you are.
Many of these new features were originally live-tested in Google's experimental Gmail interface, known simply as "Inbox".
Google has finally given Gmail users something they've been asking for: the ability to use Gmail offline.
Click on the gear icon below your user portrait. Click it and then enable the "Offline mail" tick box.
You can store emails for up to 90 days through Gmail offline, as well as queue up messages for when you next get a connection. Gmail is going to need some time to download all those messages. Second, you'll need to update your Gmail experience to the "new Gmail" before getting the option to switch to offline mode.
There's also a security section that lets users choose if they want to keep offline data on their computer or remove it.
Go to the settings page where you will find an option for "Offline".
If that sounds ghastly, then you can turn them off (they're on by default) but then we weren't sure about snoozing emails and that seems to be working out rather well, so perhaps give it a chance?
To delete stored email clear your internet history with the option to delete Cookies And Other Site Data checked (Figure D).