Email recieved as wingdings instead of Chinese

Sirec
Sirec used Ask the Experts™
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Email to a client is being delivered with wingdings font and not in Chinese as it's supposed to. The email originates from their partner who reports that there's nothing unusual their side.

Whole email message including the subject field is in wingdings (mostly question marks) although it should be showing in simplified Chinese. The same issue is seen on OWA and not just the local Outlook client. Client is on O365 running Outlook 2013.

I have tried changing language on OWA and Outlook to English and also tried changing the encoding language on Outlook with no positive effect.

Does this indicate a language error? I have read some people saying that this may happen due to the sender using a wingdings emoticon. Or could this possibly be an issue on the sender's side?
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try sending the user a test mail with the same language to make sure its not the client side issue.

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Commented:
No issues with a test email to the user in Chinese
then it is the sender side issue.. probably have him try sending again....

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