Way to keep per-client whitelist?

Some user forward mails from another host, breaks SPF and other rules. 
Some important forwarded mails must be whitelist.

Is any way to keep a file like:

forwardinghost.example: [email protected]

So if mail coming from aaa.forwardinghost.example is from [email protected] 
then make exim will accept mail.

Is any way to parse file with that format to be used in ACL rules? Or 
better solution

TIA

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