These instructions are for UMBC email accounts created or migrated in Gmail
Make sure IMAP is enabled for your account: log on to your Gmail account in your Web browser, go to your e-mail by clicking on the Mail label at the top of the page, or Inbox on the start page. Now click on Settings at the top right and then select the Forwarding and POP/IMAP tab. Check that IMAP is enabled.
From the Mac Mail menu select Preferences.
Click on the Accounts tab and then the plus sign + in the bottom left hand corner of the accounts window. Fill in your details in the Add Account window. Note that you should quote your full University e-mail address, i.e. suess@umbc.edu. Your Password should be your myUMBC password. Mac Mail will attempt to find the University's e-mail servers automatically at this point, but you will still need to configure some details yourself.
Enter your Incoming Mail Server as imap.gmail.com, using IMAP, and with your full University e-mail address as the User Name, i.e. suess@umbc.edu. Your Password should be your myUMBC password.
Ensure that Use Secure Sockets Layer (SSL) is selected, and set Authentication to Password.
Configure your Outgoing Mail Server to be smtp.gmail.com, using your full University e-mail address as your user name, i.e. suess@umbc.edu.Your Password should be your myUMBC password.
Ensure that Use Secure Sockets Layer (SSL) is selected, and set Authentication to Password
In the Mail app, click the menu item Mail then click Add Account.
Select Google from the account types then click continue.
In the Google login screen, type in your full UMBC email address then click Continue.
On the myUMBC login page, log in as you would for logging into myUMBC.
When the prompt to allow macOS to access your email, calendar, and contacts appear, choose Allow.
Select what you'd like synced to your Mac - this can be your UMBC email, calendar, contacts, and notes.
You are now ready to read your Google e-mail via Mac Mail!