Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
Vanilla 2 simply will not send notifications by email*
I am using a local (to the server) email, connecting via SMTP.
Invitation emails are sent as expected.
Notifications however, are simply not sent. Period.
I have not used V2 before, so any point in the right direction as to why email is not working only for invites would be great.