Iso2022jp - MIME header encoder for ISO-2022-JP character set
use IM/Iso2022jp;
$encoded_string_for_structured_header = struct_iso2022jp_mimefy(string);
$encoded_string_for_unstructured_header = line_iso2022jp_mimefy(string);
$rcode = header_iso2022jp_conv(\@Header, code_conv_flag);