Mail app not showing all folders and showing bulk/spam email in my inbox

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http://forums.androidcentral.com – Using the default mail app on my S3 I am not seeing a complete list of all my folders in my Rogers/Yahoo email address. I can see all the folders when I attach my Hotmail or Gmail accounts but not with my Rogers/Yahoo accounts. Has anyone experienced the same thing? Is there a way for me to display all my folders in the Rogers/Yahoo accounts? Also, All my Rogers/Yahoo accounts have Spam folders and I regularly add Spam emails to them but with the default mail client all the spam email shows up in my inbox. Some of them have a subject header that says "[Bulk]" but a lot of th (HowTos)