Why don't messages deliver from Contact form

I have just concluded moving a WordPress website from the /blog (www. kenapexvision. com/blog) sub directory back to the root directory (www. kenapexvision. com) of the site. Before now, I had built the contact form using Dreamweaver (spry validation). I adjusted the positioning of the fields for better page display from WordPress dashboard and cleaned up the "hints" and "spry validation" messages since they won't work on WordPress and then I set it up using formmail.php script. I also used a "thank you" page in the (formmail.php) script which I had hidden using "PC Hide page" plugin.

Everything worked perfectly fine while the site was in the /blog sub folder until I moved all the content of the /blog folder to the root direct. Now every other thing is working perfectly fine - the pages and all other links, including display of the "thank you" page - after comment submission. However the message doesn't deliver to the email addresses set up in the formmail.php script.

Please what could be the reason for this? I could use a contact form plugin as suggested by someone, but I want to use this method (formmail script) until I fully understand how the contact form plugins work.

Please I need an urgent assistance on what could be the reason why messages aren't delivering from the contact form and how I could correct it.

Thank you