Make sure the Mail tickbox is selected for the account.

Using IMAP ensures that all your devices see the same emails and folder structures. In Mail, choose Mail > Add Account, select an account type, then enter your account information. Emails and folder structures are stored on the server and only copies are stored locally on your devices. If you access your email on multiple devices, like your computer, phone, and tablet, you should use IMAP. These protocols allow you to receive emails using a third-party app such as Mail. IMAP stands for Internet Message Access Protocol, while POP is short for Post Office Protocol. You must also choose IMAP or POP for your email account. If you don't know these, either look them up or contact your email provider. To set up your email account manually, you need to know your user name (generally your full email address), the Incoming Mail Server, and the Outgoing Mail Server. When you first set up your Mac, you’ll have one accountthe primary administrator account for your Mac. Otherwise, if you're using an email address from an internet service provider (ISP), you may have to enter the email account settings manually. If the email account you're adding is from an email provider like Google, Yahoo, or iCloud, Mail will automatically add your email account with just your email address and password. Add an Email Account Automatically or Manually Enter your email address and select Connect. If you havent launched Outlook before, youll see a welcome screen. Email accounts can be created in the Server Application or using Workgroup. Open Outlook and select File > Add Account. Here, we'll show you how to add and remove email accounts on your Mac. Once the mail server has been set up, you will need to create email accounts.

How to add an email account on mac