wordpress form submission and the 404 error page

Question

I have the following form on a wordpress template page. I\'m getting a 404 error each time i submit the form but I\'m not using any of the reserved workpress parameter names

Answer 1

I had the same issue but I found when I submitted empty input fields (without any value in input field) that's working fine then I leave few input fields remain empty and place value in others which was also working fine.

That's means the issue was one of my input field not in wordpress or in my code.