I did try and go back to reCAPTCHA 2 but it didn’t resolve it. It appears that I was using multiple form plugins too which can cause an SMTP issue. I removed the ones I wasn’t using as I saw the plugin called pirate forms uses a different SMTP which seemed to be causing the issue. Disabling plugins that I wasn’t using and removing pirate forms sorted it. All working now.
Just out of interest, when you get errors on the screen like this, are there any places that log more detailed errors? Even Windows with it’s rubbish errors, write to the event viewer which generally holds more details that provided on screen.
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This reply was modified 6 years ago by H3Grunt.