Gmail’s native offline mode, which debuted as its redesign at Google I/O, has begun rolling out to the users. So, if the feature hasn’t landed on your account yet, don’t worry. You might get the access very soon.
To enable the native offline mode, go to Settings, then find the Offline tab and check “Enable offline mail.” If you’re using a school or work Gmail account, it has to be enabled in G Suite first by Google admin of your workplace. This option will only be seen in the new Gmail with Chrome 61 or later.
As soon as the internet connection becomes available, this native offline mode syncs your account. You can write, archive, as well as delete emails offline, which will get sorted out later. It’s completely up to you whether you want to download and keep offline data on your PC or laptop even if you sign out. Besides, there’s a new feature called Smart Compose that you can use by enabling access to experimental features. This feature will suggest you phrases and sentences based on your previous emails.