I’m having the same problem with my email field. The field name in Salesforce is ‘Email’ or ’email’ and no matter what combo I try, I can’t get it to populate into SF.
Edit:
When I go to create a ‘Web-to-Lead’ form, I put in the two email fields we have and get this back.
<label for=”email”>Email</label><input id=”email” maxlength=”80″ name=”email” size=”20″ type=”text” />
Brian / Joe's Email:<input id=”00NE0000004WLno” maxlength=”80″ name=”00NE0000004WLno” size=”20″ type=”text” />
When using ’00NE0000004WLno’ as the email field identifier when pushing data from GF to Salesforce, it works fine. When using ’email’ as the identifier, nothing gets input.