Getting rid of unwanted contacts

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http://forums.androidcentral.com – Using the default mail app that came with my phone; when I go to compose a new email and I start typing an email address I get a list of emails available from my contact list to choose from. what I noticed today is that there is a number of contacts that: 1) I don't see in my contacts but yet they show up in the mail client 2) I noticed that these contacts/email addresses are those from spam emails that I received. These are emails that are automatically going to my Spam folder (yahoo mail app and my Rogers/Yahoo internet site). Does anyone know anything about this and how I can check f (HowTos)