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For almost a year, everything was working, but now it is not. The following error message is shown upon filling out the form and clicking the Submit button: “Your submission failed because of an error.” Nothing has been changed on the website. The complete website troubleshooting, including PHP, has been performed with the hosting provider’s help.
MC4WP Other Debug Log does not show any error. Or anything at all.
When I am testing with my e-mail address, everything is working correctly, but any other e-mail entered returns a failed submission.
The page I need help with: [log in to see the link]