A workshop participant recently asked: What do I do if my entire message is my subject line? Is it okay to just use the subject line?
Yes! Considering that 60% of people who receive an email read only 50% of the message (Jeanniey Mullen, ClickZ.com, 2005), brief is always better as long as you are not compromising clarity or leaving out important details. If your message is short and clear, then it’s perfectly fine to limit its contents to the subject line.
When your entire message can fit into your subject line, simply put the abbreviation “EOM” at the end. EOM (end of message) alerts your reader that your message is complete and that they do not need to open the email.