What happens if you upload the Muse project directly to your server without exporting to HTML?
in this case I get a message "server did not report OK, got 550". See screenshot. I tried deleting all files,before uploading directly and also deleting the .htacess file after this message and starting again. I deletetd all fonts and activated them again. An restarted Muse and computer, which I will do now once again.
550 Error = blocked SMTP mail server.
Contact your web hosting provider.
Thank you. I will try tomorrow, as we are past working hours here.