Only curly brackets in email

Hi!
I just created a form and published it on my website.
I was testing it and all was OK until some user used my form.
I received only curly brackets in email with the names of fields:
{input_radio_2}
{input_text_3}
{input_text_4}
{input_text_5}
{input_text_6}
{input_text_7}
Then I went and test it again but all was fine.
Someone know whats the problem is?
Thanks

Edited:
Forgot to say that all fields except one are required.
Maybe someone was trying to hack me or something?

Hi,

Maybe the submit url was accessed directly, this may be done by a search engine bot, or maybe a user, its a good practice to add captcha or some security to the form to block users/bots from accessing the submit url directly!

Regards,
Max

Thanks, I'll try

Hi illidane,

Please see this FAQ

Bob