"Error when sending the email." message on one DNN site, but not the other

Jun 1, 2016 at 4:31 AM
I recently installed your form module onto two different DNN sites I manage. I tested your module on the first site and after hitting "Send" the data went to the e-mail address it was supposed to and I was taken to the correct page of the site afterwards. On the second website that installed the module on today, the data did not send and I got an error message at the bottom that says, "Error when sending the email. Please try again later." I checked the settings for the module on both sites and they are identical. Any idea what could be happening here? Thanks in advance!

-- Steve