Open ticket via mail to another account

Open ticket via mail to another account

Hello,

As a Service Provider, we need sometimes to open ticket for another account. Example : I receive an email from my customer and I would like to create the ticket by forwarding the email to the support address of the account. 
We setup the account xxx with the custom mail address : support.xxx@mycompany.com . So I forward the mail to this address...

Unfortunately, the ticket is created but under my own Account.

How can I do to have this ticket under to account xxx ? 

Thanks for your help
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