[otrs] How to Set the customer based on the domain-part of the e-mail

Hi, First of all: OTRS is awesome ! Thanks for the great job... ;) My customers open tickets in OTRS only by e-mail. How can I set the customer (and customer ID) using the domain part of the e-mail ? What I need is to create a single user per customer and assign the tickets based on the domain: *@bar.com = customer bar Sorry if this was already answered, but I didn't find in any place. Best regards, Alexandre OTRS 2.3.4