[otrs] customer auto reply stop

Hi All, OTRS notification system sending customer notification and customer also replying email ticket update is fine. Customer some time set as auto reply like I am out office like some other auto reply . this type auto reply how stop anybody let know Postmaster filter option I set subject out of office filter and hear set OTRS ignore - yes it is working fine, Anybody help other way stop the auto reply mails. Thank you, Regards, Kalyana chakravarthy M .P,