How can i get Real Spam patterns to test Spamasssin signatures?

[shiva prasad]

Hi all,
          I use a propriety router that in turn uses Spamassisn for
detection of SPAM mails.
    I only have the option of testing with "GTUBE" Spam pattern.

   Can any one suggest me if i can get host of Real spam patterns so that  i
can test the detection capability(efficiency) of
Spamasssin in turn my router?

Thanks
sivabadana