I think I know why you don't have reply... this is because the field where you ask for email on your form is not treated as an email address... it is treated as any other data from the form. So the script doesn't take it for an address, and thus cannot send backt to it..
There are two ways to change this... 3 in fact :
1 - you add a line into the script to make the sender address = the field he as entered. this should work, however, it makes the script a little more specialized in that form and it won't be as easy to use it for another if you don't use the same field name for the email info.
2 - you add a line in the form to make the sender adress = the field he has entered. This is the better way I think. as it leaves the script untuched.
3 - you turn back the value to 0 and let off the confirmation mail.
I'm writing the lines you would need to insert in your form to get this working, let me know if you want them...
As for postmaster
Try an open a new topic for this issue, someone else may figure out why this happens... specifying this occurs in NMS frommail script