How to configure requester sorting by email address domain

How to configure requester sorting by email address domain

I've configured Sites, so the question is how to make some kind of automation rule, for example:

request is sent from particular mail domain -> to service desk's incoming mailbox. System creates Requester after fetching mail and if mail domain is for example @gmail.com - > associate this requester to site "Named A"

Or what is the best approach to do this?

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