If it is unable to verify the password, then it will give you a message: “Additional account information required”. Apple Mail will try to verify the password before continuing. You can also find documentation on changing your email password if you have forgotten it or if it needs to be updated. This was set when you created the email account in cPanel. Fill in your User Name and your Password for the email account.If you need help with this field, please review the tutorial on finding your email settings. Click in the Mail Server field and type in the setting for your mail server.In the Incoming Mail Server info window, select the account protocol that you wish to use: IMAP or POP.If it cannot create the account automatically, then you will see a message appear stating “Account must be manually configured.” Click on Next in order to get to the next step. Apple Mail will then attempt to auto-create the account. Fill in the fields then click on CREATE to continue. You will see a window labeled Add a Mail Account that allows you to add the full name, email address and password for the account you’re setting up.Leave this option selected and click on the Create button to continue. By default, it is set to “Add a Mail account”.

You will then see another list of account types. If you used either of the other methods, click on Add Other Account at the bottom of the email account types. If you selected Add Account from the Mail menu list, then click on Add Other Mail Account, then the click on Continue.

Depending on the method you used above, you will see one of two screens to add an email account.

Scroll down, and click on Add Other Account to start the account addition process. In the same Internet Accounts screen, you can click on any existing account in the left-hand column, then click on the plus sign in the bottom left hand corner to make the list appear for the account types at right. If you’re not using a mouse, but you have a trackpad, you can scroll up or down the list by placing the mouse pointer over the list, then use two fingers simultaneously and stroke the pad either up or down. Scroll to the bottom of that list and then select Add Other Account. You can also click on Accounts and then you will see a window labeled Internet Accounts with a list of email account types listed at the right starting with iCloud. In the menu bar for Mail, scroll down and click on Add Account.

There are a few different ways to open a new account.

Setting up an Email Account with Apple Mail (Mavericks version)

How to set up email on mac pro