new Mac air ...how to add email to mail ? directions were followed, but no mail in inbox

Make sure to follow these instructions carefully in order to set up your mail account

Use the Mail app  on your Mac to send, receive and manage email for all your email accounts in one location on your Mac. Simply add your existing accounts — such as iCloud, Exchange, Google, school, work or other — in Mail.

• The first time you open Mail, you may be asked to add an account. Select an account type or Other Mail Account, then enter your account information.
• If you already added an email account, you can still add more. In Mail, choose Mail > Add Account, select an account type, then enter your account information. Make sure the Mail tickbox is selected for the account.
• If you’re using an account on your Mac with other apps, such as Contacts or Messages, you can also use that account with Mail. In Mail, choose Mail > Accounts to open Internet Accounts settings, then click Add Account on the right.
• You can set options for your email accounts in Mail settings.