IMAP Setup - Apple Mail
Solutions found here.

New Account

If this is the first time you have opened Mail, you will likely be presented with a screen similar to the one below.

Select Account Type IMAP and fill in your info.

Incoming Mail Server

Enter imap.yourdomain.com and your complete email address

Incoming Mail Security

Leave SSL unchecked

Authentication should be password

Out Going Mail Server

Check Use Authentication and enter in your complete email address and password

Out Going Mail Security

Leave Secure Socketes Layer (SSL) Unchecked

Authentication should be password

Account Summary

Verify your account settings and continue if they are correct

Conclusion

Click Done

Begin enjoying your E-Mail