1. Launch the Mail app. (Click the icon in the dock or go to the Applications folder to open it.)
2. Add a mail account:
3. Enter the following information:
4. Click Create when done.
5. A message saying that the account must be manually configured will displayed on the screen. Click Next.
6. Enter the following information for the incoming mail server:
7. Click Next when done.
8. Enter the following information for the outgoing mail server:
9. Click Create when done.

• If you have not previously configured an account in Mail you will be prompted to add an account. Click Add Other Mail Account and then click Continue.
• Otherwise, go to the Mail menu and click Accounts. Click Add Other Account > Add a Mail Account and then click Create.

• Full Name: The name you want displayed on your outgoing mail.
• Email Address: Your full email address. 
• Password: Your password.

• Account Type: IMAP
• Mail Server: mail.name.com
• User Name: Your full email address. 
• Password: Your password.

• SMTP Server: mail.name.com
• User Name: Your full email address. 
• Password: Your password.

Adjust the configuration:
Next you need to go to the Mail preferences to verify and adjust your email settings.

Server Name: mail.name.com

• Use custom port: 587 or 465
• Use Secure Sockets Layer (SSL): Make sure this box is checked. 
• Authentication: Password
• User Name: Your full email address.
• Password: Your password.

• Store draft messages on the server: Checked.
• Store sent messages on the server: Checked.
• Store junk messages on the server: Unchecked.
• Move deleted messages to the Trash mailbox: Checked.
• Store deleted messages on the server: Checked.
• Note: You must complete additional steps described in the Set Special Folders section for these settings to properly work.

• Include when automatically checking for new mail: Make sure this box is checked. 
• Automatically download all attachments: Make sure this box is checked. 
• IMAP Path Prefix: Leave this blank. 
• Port: 993
• Use SSL: Make sure this box is checked. 
• Authentication: Password
• Use IDLE command if the server supports it: Make sure this box is checked.