Hi. On Fri, Mar 27, 2020 at 02:22:18PM +0200, Andrei POPESCU wrote: > > or an attachment was named using non-Latin characters. > > Is that non-Latin or non-ASCII?
I'm not that familiar with the languages to qualify Romanian as a Latin or a non-Latin language, but your attachment really is: Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename*=utf-8''%C8%99urubelni%C8%9B%C4%83_empty%2Etxt So, that's Unicode, at least a part of it, namely - \uc899, \uc89b and \uc483 glyphs. rfc2047_parameters works on it as intended btw. > The former would imply about half of the > world's population, the latter something like two thirds or more (just > guessing, didn't check numbers). Even for those cases there's a legitimate need to attach a file which name conforms to ASCII. Source code, patches, images with names like 20200327143420.jpg etc. Reco