Hi Aleksandar,
I don't know is this is supproted OTB in kentico, but one way how you can do it is by handling it in events (check here possible events for biz form).
When you register your event properly and confirm that is triggered in desirable situations, you can use some of this code to send email notification:
EmailTemplateInfo eti = EmailTemplateProvider.GetEmailTemplate("MyCustomEmailTemplateCodeName", SiteContext.CurrentSiteID);
if (eti != null)
{
MacroResolver mcr = MacroResolver.GetInstance();
mcr.SetNamedSourceData("FirstName", "Dragoljub"); //you can get this data(first name) from biz form
msg.EmailFormat = EmailFormatEnum.Both;
msg.Recipients = "dragoljub.ilic@test.com";//that you take form online form (separated by ';')
msg.Subject = eti.TemplateSubject;
EmailSender.SendEmailWithTemplateText(SiteContext.CurrentSiteName, msg, eti, mcr, true);
}
Best regards,
Dragoljub