Common Craft's latest video.
By watching Clear Email Communication viewers can learn how to get a recipient's attention and how to get a response from recipients.
On the topic of email communication, Emailing Your Teacher, With Captain Communicator is one of my favorite videos about email etiquette. The short video features two students demonstrating how to write an email to a teacher. It's cute and well worth 90 seconds of your time.
The following video was made by a teacher for the purpose of sharing email etiquette tips with students. It's a bit more serious that the Captain Communicator video.
Disclosure: I have a long-standing in-kind relationship with Common Craft.