Optimum provide instructions for using Apple's Mail application (See links below). Setting Up E-Mail on Mac OS X Mail
Open Apple Mail.
Click Mail then Preferences.
Go to the Accounts tab and click the plus (+) button underneath the Accounts field to add a new account.
Select POP3 in Account Type.
Enter your Optimum Online® e-mail address in the email Address field.
In the Full Name field, type your name how you'd like it to appear when people get e-mail from you (for example: John Smith).
Enter your e-mail server name [what's this?] in the Incoming Mail Server field.
Enter your Optimum ID in the User Name field. (Your Optimum ID is the part of your e-mail address to the left of the "@" sign, for example: jsmith.)
Enter your password in the Password field.
Enter your e-mail server name in the Outgoing Mail Server (SMTP) field.
Click OK
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