Hi Nikola, Your plugin is fantastic! There seems to be just one small issue with it - at least in my case. Namely, the appointment confirmation e-mails do not get sent/ delivered to customer Gmail accounts... Please note that everything works fine in case of customer e-mails hosted on dedicated servers (@companyname.com) or the iCloud ones. Also, the admin confirmation e-mails work just fine. Any idea how to fix this?