mail being sent from nobody

I have several accounts running a x-cart shopping cart. Two of them are sending out email coming from nobody@hostdomain.com instead from user@virtualdomain.com.

I have looked through their cart configuration files and can't find any place where their email addresses are not added into the right fields.

Is there something at the server level that will force the scripts to send email from the individual domains?

 

 

 

 

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