Yes all the strings are UTF-8 encoded. I have attached the start file for my CQ5 in case this could help you guys with the issue.

Yes. I type in my company email into the "mailto" space. Version 5.4. It works when I type in non diacritic words e.g test. However whenever I enter ay diacritic words like ö I get the error.

Hi,I am having an issue with the subject line in a form when I want to send an email. It does not accept words like ä in the subject line. It returns the error "org.apache.commons.mail.EmailException: Encoding error (500)". Can anyone please help me with this. Thanks