Send customer notifications only to mapped customers

I'm trying to enable this feature, but with no luck. I've changed this setting to YES in SysConfig::Core::Ticket CustomerNotifyJustToRealCustomer: Send customer notifications just to mapped customer. Normally if no customer is mapped, the latest customer sender gets the notification. No Sì (Default: No) But nothing happens, the system keeps sending emails to every address it receives messages from. Is this a bug? (I've given a quick look to bugzilla but couldn't find nothing related) -- Gabriele D'Andrea Tel. +39 085 9431161 . Fax +39 085 9431162 . gabriele.dandrea@ecohmedia.com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ECOH MEDIA S.r.l. Via Milano 32, 21019 Somma Lombardo (VA) . Via F. Fellini 2, 65010 Spoltore (PE) . Italy . www.ecohmedia.com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Le informazioni contenute in questo messaggio di posta elettronica sono riservate e confidenziali e ne è vietata la diffusione in qualunque modo eseguita. Qualora Lei non fosse la persona a cui il presente messaggio è destinato, La invitiamo ad eliminarlo e a non leggerlo, dandocene gentilmente comunicazione. The information contained in this e-mail and any attachments are confidential and may also privileged. If you are not the named recipient, please notify the sender immediately and do not disclose
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Gabriele D'Andrea