I was setting up an autoresponder in chronoforms and was getting the following error.
The first email to the site owner went and “your message was sent” displayed, but the autoresponder email element was causing the “Mailer Error”.
I had “email” in the Dynamic to field; however, the I got this error.
How I fixed it was by using a legitimate email address in the “from email” field in the first part of the email element in the setup tab of chronoforms.
I hope this helps someone else out there…