EXS,
This looks like some kind of character encoding problem that your laptop (flukeishly) is able to decipher.
What kind of email service are you using? Hotmail, Gmail? If it's company mail, are you allowed to say the domain?
Also, what are the email clients (or is it a web browser in all cases)?
Are any of the senders in China by any chance? Or likely to be using an email client running under a foreign language?