Incoming and Outgoing mail server ?

[Sudhakar]

For both incoming and outgoing mail server, put mail.yourdomain.com.

This remains true for your addon and parked domains when you are checking email for them and need to set up your account in your email client.

If you know the IP address or the hostname of the server which you are on, you may use that information instead of mail.yourdomain.com (useful if your domain is new).