Having this same issue and tried the above fix. Still not quite working. Before the fix, I would submit and nothing happened. Not errors. Using RS From Pro module. After the fix, it strips out the @ and the period in the email address after submit and tells me its invalid input. For example if I enter firstname.lastname@example.org
, hit submit, it replaces it with danmailcom and tells me it is invalid input. For now I will just comment out this code until it gets fully sorted.