Version v0.40 of Metabase is no longer supported. Check out the docs for the current stable version, Metabase v0.63.
I’m not getting the email notifications I expect to
Since Metabase is a self-hosted tool, email notifications must be configured by someone in your organization. They should be able to check the configuration settings and make sure everything is set up correctly; it may help to point them to this guide.
Read docs for other versions of Metabase.