A good webinar on Email security
Another one from the National Cybersecurity Awareness Team. This one covers email security, given by Corey Allert, Manager of Network Security for FedEx.
Video here: https://youtu.be/1n067p_820Y
Presentation slides here: https://staysafeonline.org/wp-content/uploads/2018/08/CSMB-Webinar-Slides-August-08-13-18_Email-Authentication.pdf