frontpage form exploit

It seems like my frontpage forms my server our being used for spam. I form message like

Name: spaininpain@aol.com
To: spaininpain@aol.com
From: spaininpain@aol.com
Subject: G(CDA0CFF5,Name)I

w3VcjtTLx8W4UqmAGa yVNMCE28IrZIw9UAnI

I gotten from several of my customers. Anyone know how to prevent this.

 

 

 

 

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