We have released cnMaestro On-Premises 2.1.0 with email notification support.
Please check the release notes https://support.cambiumnetworks.com/files/cnmaestro/
The community announcement link is http://community.cambiumnetworks.com/t5/cnMaestro/cnMaestro-2-1-0-On-Premises/m-p/98194
Rupam