Some document formats , such as HTML , PostScript and Rich Text Format have their own 7 - bit encoding schemes for non-ASCII characters .
Some document formats , such as HTML , PostScript and Rich Text Format can thus be sent without using any special email encodings .
Some document formats , such as HTML , PostScript and Rich Text Format have their own 7 - bit encoding schemes for non-ASCII characters and can thus be sent without using any special email encodings .