[otrs] How advise for mail unlocked that were locked ?

Hi, I'd like to be advised (with a different color o other) when a ticket (that was locked, but then has been unlocked) receive a mail from the customer using the same mail object ticket number. Is it possible ? how? Thanks *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Paiusco Alessandro Infonet Srl _ (o)_ //\ V_/_ *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*