Step 1: When you first open Mail you will see the “Welcome to Mail” dialog

Step 2: Fill in your full name, email address, and password. Click “Continue”.

Step 3: Click the Option key when clicking “Continue” to manually enter your email server settings; however, if an email address is entered where Mail has no email server settings, follow the onscreen instructions to manually enter in the email service providers server settings.

Step 4: To add another email account follow one of these steps:

• In Mail select File > Add Account… then follow the onscreen instructions.
• Select Apple  menu > System Preferences… > Mail, Contacts & Calendars
  • Click your email service provider or “Add Other Account…” then follow the onscreen instructions.