In April 2019 Google has announced its new feature to schedule mail using Gmail. Earlier it was done using third party add-ons
To schedule a message via Gmail in a desktop web browser, follow these steps below :-
- Click on Compose to create a new email
- Click the triangle next to the blue “Send” button
- Select one of the suggested times, or click “Pick date & time” to customize when exactly you want the message to go out
- Click “Schedule send”
The process is exactly same for mobile device also the only thing is that you have to click on the three dots on top right corner of the mail after composing it.