[Plugin: Contact Form 7] CF7 doesn’t work for me

I have installed CF7 and followed all of the instructions, but when I submit my contact form, I receive an email but there is no data contained within it.

I have tried uninstalling the plugin, deleting all of the files off of the server and re-installing the plugin — but it still doesn’t work. I didn’t even change the sample form that came with the plugin. I just wanted to see if it would work before I customized the form.

Can anyone help me with this? Thanks in advance for any and all replies!

Joe