WireIT: The emails are send through a third party smtp server which shows as being from "noreply@leaserig.net via sendgrid.me".  The site overall has been sending emails, have you seen any activity in your spam folder?  I had to setup a filter in gmail to keep going to my inbox, especially after a flood of pool configuration errors.  As an alternative potential solution, try setting you leaserig email setting to 'no', log out and clear your cache and then log back in and set the emails to yes again.  You could have bad JavaScript that is keeping the setting correctly, also check your browser console as you change that setting to check for errors while it is being changed.  If there is more information as to the nature of the issue, it will make a specific solution more forthcoming, so let me know what you find.