qmail headers problem

I am currently using qmail with mysql to do the forwarding for my site customers. So if someone registers on my site they get assigned an email username@mysite.com, this email forwards all the mail sent to it, to their real email address.

I am trying to change the headers of forwarded email so it doesnt look like it came from admin@mysite.com, but show actual real senders headers. Some people complain about spam and I know its not me. So i want to be just the transparent forwarder. Does anyone know how I can quickly resolve this? Is there a config for headers I need to change?

Much appreciated!

 

 

 

 

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