1. Goto Add Account.. option from Mail Menu of apple Mail.
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2. Select Add Other Mail Account… then click on Continue
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3. Add a Mail Account details: Name, Email and Password then click Create
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4. Add Incoming Mail Server Info : Select IMAP in account type, then Enter your IMAP Mail Server address, Your full email address as User Name and password then click Next
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5. Verify Certificate : If you have configure SSL on your imap and if it is self signed certificate then you might get this additional box, Just click Connect.
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6. Outgoing Mail server Info : Just Enter your SMTP mail server details then click Create
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