Teaching Email / The Message That Gets Read
The subject line is doing most of the work.
It is the only part you can be confident every recipient reads.
A subject line is not a title. A title describes; a subject line sorts. Your reader is looking at a list of twenty unread items and deciding, in roughly a second each, which ones matter now, which ones matter later and which ones are noise. A subject line that says only the course name tells them nothing, so the message falls into the later pile, and later is a place messages go to die. A subject line that names the specific thing and the specific need survives that sort.
Two ingredients earn their place: what this is about, and what it needs. If a message needs a form back by a date, the date belongs in the subject line, not buried in the fourth paragraph. If a message needs nothing and is purely informational, saying so is a kindness, because it lets a busy reader relax into it rather than scanning anxiously for a hidden obligation. Something as small as a leading word signalling no action needed changes the emotional shape of the reading.
Consistency compounds. If your reminders always begin the same way and your results messages always begin another way, families learn your patterns and triage you correctly without effort. That is a form of respect you can pay at no cost. Avoid urgency words for routine matters. If everything is marked important, nothing is, and the first time something genuinely is urgent you will have spent the currency you needed.