Please, stay calm, man :)
Sorry, I don't know what email-handler is actually used for and what's its relationship with acs-mail (the package providing the mail functionalities in OpenACS). This document
tells more about acs-mail, but seems to be rather old already.
And yes, you told me your usage and I told you that OpenACS Forums package can already do that so you don't have to reinvent the wheel if you don't insist doing that.
But if you are determined to use email-handler whatever it takes, I have to apologize since I can't help you more on that. Like you said, there doesn't seem to be a lot of docs around for it. I hope someone else can help you further.