character sets message data types standard types transformation programs data representation network messages data types local types protocol

character sets ietf domain names unicode idna localization script rfc 3490 internationalization dns

character sets cjk unicode unified ccs internationalization

character sets email imap standards security protocols utf-8 encoding internationalization authentication

character sets performance mappings standards security unicode idna protocols internationalization dns

language support character sets cyrillic guidelines domain names idn internationalization dns registration

character sets email email headers protocols utf-8 smtp email addresses mail transfer agent standards track internationalization