Greetings, and good news.
But first, thanks for all the generous help I am receiving!
I also assumed that it might not be possible to `forge' the Return-Path header, but decided I would try anyhow, and added the line

        print MAIL "Return-Path: $from\n";
[download]

to my soup. To my surprise it worked, and the subscription button works fine now. That header was disturbingly easy to change . . .

Now I need to take a closer look at security. But it sure is nice to have overcome this particular troll.
Since I am hosted by `Prohosting.com' I took what they have given, and that is ezmlm for a mailing list.

Thanks again to all that had mercy on my little silly predicament!
Dagfinn

Volda, Norway, where trolls dance on the telephonewires