Inbound Emails from same sender to multiple receivers being forwarded into ServiceNow

[JStockel]

Hello, friends

Wanted scenario: Supplier ABC sends an e-mail to finance@company.com and payroll@company.com, they then forward it into our ServiceNow instance, and creates 2 separate cases, one which is decided as the route for finance mail, and once which is decided as the route for the payroll mail, with pre-determined assignment groups, which are different.

Now, this works totally fine, when it's just one of them receiving it and forwarding it into our instance and putting it correctly according to the set up actions.
But when there are 2 at the same time, forwarding the same, they get put into the correct table, but no assignment group is determined, which leaves them in an unwanted limbo for end-users. They come in, through the flow as normally, but doesn't manage to evaluate any of the set up email rules we have. 

If the mail addresses are also, instead set as Bcc when sent from the supplier, they instead come in as Calls.

How can we separate an incoming email which is from the same original sender and then forwarded from 2 addresses? Anyone who has done something similar? 

[palanikumar]

There is no OOTB option available.

If you want to find the original sender, then you need to parse the HTML body and find the sender