1. OPEN Mac mail, CHOOSE "Add Other Mail Account". Then CLICK the "Continue" button.
2. INPUT the necessary information and CLICK "Create" button.
3. You will be asked to "Account must be manually configured", CLICK "Create".
4. Incoming Mail Server Info:
   Account Type: POP
   Mail Server: mail.yourdomainname (e.g mail.leentechsystems.com)
   Username: Your email address (e.g support@leentechsystems.com)
   Password: Your email password
5. CLICK "Next".
6. A pop up window will appear, CLICK "Connect"
7. Outgoing mail Server Info:
   SMTP Server: mail.yourdomainname (e.g mail.leentechsystems.com)
   Username: Your email address (e.g support@leentechsystems.com)
   Password: Your email password
   USE these information:
   Incoming mail server: Port: 110
   Outgoing mail server: Port: 26
8. Text will appear: "Additional account information needed", CLICK "Next".
9. CLICK "Create".
10. TEST account, if mail did not send, CLICK "Edit SMTP Server List".
11. On advance tab, CLICK "Use custom port:" 26, and then CLICK "OK".
12. On Account Information tab, CHECK on "Enable this account" and "Use only this server". MAKE sure the information is correct:
    Description: either your name or your email address.
    Email Address: your email address
    Full Name: your name
    Incoming mail server: mail.yourdomainname (eg. leentechsystems.com)
    Password: your email password.
13. On Mailbox Behavior tab, you may CHECK "Move deleted messages to the trash mailbox".
14. On Advanced tab, CHECK "Include when automatically checking for new messages". Then CLICK "SSL" on the port.
15. Then CLICK "Try with Selected Server".
16. Finish.