Junk Folder Not Receiving eMails Anymore?

[Spokendisease]

I have yahoo as my main mail account and I have it loaded up with a compuserve account on the default (?) email app that came with the phone but I can't get to the messages in the "Junk" folder of my yahoo account. It's always empty but I usually get about 20 emails a day of spam and junk and the website is showing all the junk and spam. Now I know all of you might think this is a GOOD thing, but some of my wedding vendors' emails have ended up in this folder before and I want to make sure that it doesn't happen again with any important emails I'm expecting. Anyone else having this problem?