How to change return address for default email

I don't know where this could be changed. A client says the
return address when I get an email from the web site says username@servername.domain.com <username@servername.domain.com>. She need that changed, and says that on the last server were on it had to be changed from the server side.

Does anybody here know what file/entry to look after? It's a WHM/CPanel server.

Thanks
John

 

 

 

 

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