subscribe by email don't send email confirmation to subscribers

Hi,
I think we had this before but I can't find the old thread.
I am trying to subscribe to the following subsite but the plugin SBE don't send an email to confirm the subscribtion.
subsite: http://www.pixshopping.com/4m4progettazionistore/
Last time I remember that there was a conflict with Subscribtion from Jetpack.
So this time Subscribtion is not active but still SBE is not sending out an email.
Can you help?
Support access is granted as well.
Thanks.
Paddy