id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
14964	create_attachment support for unicode symbols in filename	Anton Chaporgin	nobody	"When attaching a file containing non ASCII symbols, the standarts required adding special prefix to the filename. For example, when file name is in unicode, like u""Имя Файла.txt"" (""filename.txt"" in english), the headers in the letter should be

filename: ""UTF-8''%C3%90%C2%98%C3%90%C2%BC%C3%91%C2%8F%20%C3%90%C2%A4%C3%90%C2%B0%C3%90%C2%B9%C3%90%C2%BB%C3%90%C2%B0.txt""

So, I suggest adding special check for this case in ""_create_attachment"" method of EmailMessage class, see attached diff."	Bug	closed	Core (Mail)	dev	Normal	fixed	email attachment, filenames, i18n		Ready for checkin	1	0	0	0	0	0