Can't get rid of email duplicates

Hi - I always receive email duplicates for the email to the website owner and the confirmation email to the person that entered data into the contact form. The debugger result is attached for clarification.

Can someone help me with this? I guess you need to the see email configuration?

Thanks for help! Frank

Hi Frank,

Maybe its the same issue posted here:
https://www.chronoengine.com/forums/posts/t104347/plugin-after-installation-joomla-3-8-0-no-longer-works-when-using-security-image

Best regards,
Max