Hi all, please can anyone help me with this question below?

1 - I'm need to send web to lead records trough omni channel to sales team.

2 - If Salesforce already have a business account in the system, registered with the same email domain, (@dreamhouse.com, for example), this lead cannot be distributed, but registered as a new contact within the existing account. How can I get the system query the database and check if there is already another record that meets the criteria before being routed? Process builder or trigger?