English text/sentence has "spaces" separating the words. A long line is wrapped from a "space" character.

However, Asian text is composed of double-byte characters with NO "spaces" in between them. Therefore, a normal English email program does not know where to "break" (wrap) a long Asian language text/line. When a long Chinese line is wrapped wrongly in the middle of a character, a whole line of Chinese text will be corrupted.

You can edit the corrupted line by removing one half character at the front of the line. Or you can ask your friend to send Chinese message with pre-wrapped shorter lines.

NJStar Communicator has an "Universal Code Convertor" which allows you to copy and convert/wrap a long Asian language text into shorter lines to read.