If you have created a mailbox through the Nucleus controlpanel, you can receive this mail on your Apple computer. Therefore one should perform following configurations in the “Apple mail” program.
Open Apple Mail en choose “File” followed by “Add Account”.
In the following window you should give up a name for the account, accompagnied by the email address and password.
Now you have to enter the incoming mailserver; mail.nucleus.be. Also here you should give up a username and password. The username is the part before the @ in the email address.
The incoming security also works with a password.
As outgoing mailserver you should use the one of your provider. At the bottom of this page there is a list of related articles. There is also an article containing the SMTP servers of belgian internet providers.
Most internet providers don’t require authentication for outgoing mail.