E-mail bounce when using special characters in Subject

when sending e-mails from within ERPNext we some times get a bounce from the recieving e-mail server

this is due to special characters used in subject like ö, ü, ä which are commonly used in the german language.

Is there any pending github issue for this? ( I know it is more of a frappe/frappe thing rather then frappe/erpnext)

Thanks
Best
Wolfram

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