Form not posting correctly

I have recently installed 1.5 (clean, not an upgrade), and am trying to set up a page that would allow users to submit a form to be added to my mailing list (I use listmailpro).
The code is as follows:
<form method=post action=https://www.patentchronicles.com/newsletter/signup.php>
<input type=hidden name=list value=1>
First Name: <input type=text name=fname size=10><br>
Last Name: <input type=text name=lname size=10><br>
Email: <input type=text name=email><br>
<input type=submit name=sup value=”Subscribe Me!”>
</form>
When I try to subscribe (filling out all the fields), the error I get from ListMailPro says “There were errors with your subscription to our mailing list.

The error messages are as follows:
You didn’t enter an email address.”
The code works just fine when not part of a wordpress page.
The form can be seen at https://www.patentchronicles.com/monthly-patent-chronicles/
Any ideas?