This means you’ve got the option to access your Gmail account through Mail.
Here’s how to access IMAP-configured Gmail on a Mac by adding your account to the Mail app.
pop fire up Mail tool on the Mac.

In theMailmenu, chooseAdd Accountfrom the options.
In theChoose a Mail account providerscreen, selectGoogleand clickContinue.
SelectOpen BrowsertoallowGoogle to complete authentication.

throw in your Gmail email address and clickNext.
bang out your password and clickNext.
Google lists the permissions you are granting macOS.

Review them and then clickAllowat the bottom of the screen.
Click theiicon next to each item for more information.
A list of apps appears.

hit the check box next to each app you want to sync, then clickDone.
Along with your mail, you might opt to sync your Contacts, Calendars, and Notes from Gmail.
The address you added will now appear in theMailboxessection of the Mail sidebar.

Using IMAP with Gmail requires IMAP server options.
To use Gmail via POP requires that you enable POP through your Gmail account.
If you do that, you might also need to enter theGmail POP server settingsin Mail.

However, the setup instructions for those email clients are not the same as the steps above.
They are similar and require the same IMAP and POP server information linked above.
Another way to get to Gmail on your Mac is to accessGmail.com.

It works in Safari and other web browsers you might use.