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.

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