When you make a simple form up in HTML it goes something like this...
<form method="post" action="target_file.???">
<input type="text" value="enter your name here.." name="uname" />
<input type="submit" value="submit" />
</form>
...when you press submit, then the values in your input fields (uname for example) are passed to the target code or script to handle the form, which then in turn sends the form data to your email address. Normally the email address is in the target code, which in your case, looks like feedback.html.
I'm not up on MS Frontpage, but I had quick peek on the net and found this:
webbot bot="SaveResults"
U-File="_private/form_results.csv"
S-Format="TEXT/CSV" S-Label-Fields="TRUE"
B-Reverse-Chronology="FALSE"
S-Email-Format="TEXT/PRE"
S-Email-Address="test@test.com"
B-Email-Label-Fields="TRUE"
S-Builtin-Fields
U-Confirmation-Url="index.htm"
...which appears to be the FrontPage setup fields associated with the process you mentioned regarding providing your email address. From what I can see this information should be in your target file, which is...
action="_vti_bin/shtml.exe/feedback.htm"
...I've had a look at this file for you, and the these fields seem to be missing, which could be the problem...
S-Email-Format="TEXT/PRE"
S-Email-Address="test@test.com"
If that's correct then either manually edit in these fields, or go through the MS FrontPage process again to see what may have happened.
Sorry I can't be of more help.