IMAP Server Settings
                     IMAP Server Settings
IMAP Server Settings-IMAP is used by email 
clients and web-based email applications to 
retrieve email messages from the mail server. 
Follow our Steps.
Step 1:
First, enable the IMAP on your Gmail account to access the IMAP email server settings.
Step 2:
To enable IMAP in Gmail, open your web browser, and access your email server page.
Step 3:
Enter your Gmail address and password to log in to your Gmail account.
Step 4:
Click on the Settings icon displayed on the top-right corner.
Step 5:
Select the Forwarding and POP/IMAP tab on the displayed window and select Enable IMAP for 
all mail in the IMAP Access column.
Step 6:
Click Save changes and log out from your Gmail account.
More Info: https://mail-setup.com/how-to-setup/imap-email-server-settings