[otrs] RES: How to remove a invalid address in OTRS 5

Sorry... incomplete message sent from my faulty mail client!!! Sending again: Hi! Using OTRS 5.0.25 on Linux with MySQL. In our ticket system, we would like our team to respond tickets for company e-mails only. The team has been warned to remove invalid adresses, but nevertheless, I also would like to add a rule for OTRS to automatically remove any address @gmail.com, @hotmail.com, @outlook.com (the most obvious). I know this is not perfect, but I can add more @domains later, making it more precise. Can this be accomplishd in OTRS? Can I create a database trigger that strip this from the tickets? Your help will be higly appreciated. Regards, Edson