To connect your Google Mail account to your other devices such as the computer, smartphone or OS X system running computers you’ve to enable IMAP in your Gmail account.
The first step you have to do is to enable IMAP in your Google Mail or Gmail account.
You can easily enable IMAP or POP on your Google Mail account using your computer. Follow the step-by-step guide to enable IMAP in your Gmail account.
Enabling of IMAP In Gmail
Follow the below Step-by-Step guides with Screenshots to enable or disable the IMAP feature on your Gmail Account.
Sign into your Gmail Account
Now go the “Account Setting” on your Gmail Account
Now in the account settings go to the Forwarding and IMAP / POP
Now Enable IMAP > Save settings.