Using internal email for ticket creation without customer's FROM email address

Hello,

We have a commerce sending internal emails to C4C and SAP Marketing.
When internal email is received, we would like to create a ticket for the specific customer for which email was sent.
But because email is sent by commerce internally, we can not spoof customer's email id as "From" or "Sender".
In order to avoid spoofing and use of external relay server, is there any way to segregate information from the internal emails like customer email in the body or subject and use that information to create ticket for respective customer.
and assign it to specific channel.

Any help on this topic is highly appreciated.

Thank you,

-Abhinay