On Wed, Dec 28, 2016 at 04:02:00PM +0000, Niels Thykier wrote: > I am not an expert on permitted ways of quoting UTF-8 in mail headers, > but the base64 method does not seem entirely inconceivable for some RFC > to support that (especially not considering you can encode the body with > base64). You might want to look at RFC 2047.