Duplicate Growl Notification, even when turning 'only in inbox' option ON

[Hassen Taidirt]

Hi,

I always get a duplicate Growlmail notification for every email received, even when I activate 'Only notify for emails in your inbox' (see attached screenshot.)

All the solutions I found on Google asked to turn this option on. That's what I did but I still get double notification.

Is that anything to do with Growl settings? Or Mail.app settings?

Thanks in advance.

P.S.: I didn't set this problem as an issue, because it may just be relative to my settings.