Box Trapper, message format&commands

I'm trying to use Box Trapper to send a response to my Black Listed addresses which will appear to be a 'bounced' response.

However, I cannot get the email header to be sent from anything other than the address which received the spam, i.e. I'd rather have the message appear to be from "postmaster@"mydomain...?

Is there anywhere I can fiond a list of opperators (%commans%) , what they do and how thay work..? and is it possible to use these to achieve the above?

Thanks

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