If you are using POP3 on Ms Outlook, you can get email from Junk mailbox instead of the default Inbox, by specifying -Junk suffix to your login name, like follows:

 user-Junk@lookafter.com

Note that Junk mailbox name are case sensitive, and it is the only one special mailbox available under POP3 access.

• Getting emails from junk folder on Ms Outlook with POP3
• Getting emails from junk folder on Mozilla Thunderbird with POP3

Use IMAP instead of POP3 if you wish to access multiple mailboxes with mail client.