I added a Gmail account in WLM using 'POP3', then let incoming server require 'SSL'. However, outgoing doesn't need SSL. But when I receive a new mail, I see it saved in Junk of the account added in WLM. On the other hand, when I made outgoing sever require SSL, any new mail became saved in inbox. 

I am quite sure that an incoming  server of mail client is responsible for receiving mails from remote mail server. Thus, I think that any new mails should be saved in inbox even outgoing is set up to not require SSL.