...on Wed, Mar 01, 2006 at 05:01:52PM -0600, Joel Gudknecht wrote:

 > I'm concerned that sendmail is even accepting these messages as they
 > have nothing to do with my domain and I don't know how to prevent this
 > behavior, any info on this subject would be appreciated, thank you.

>From the snippet you posted, it seems as if someone 
sends spam using your address/domain as sender, and 
you get the bounces. Unfortunately, nothing unusual 
about that, and not much you can do.

Alex.

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