Question

In which part of a professional email should you try to be brief, but highly descriptive?

Answer 1

You should try to be brief, but highly descriptive in the part of a professional email known as the subject line.
In the subject line, you shouldn't write too many words, but rather pick out words that convey your message in a few characters. Try to be highly descriptive, so as to show the recipient what you want to tell them in the first couple of words.