I am one of those instructors who is more formal. I do expect and hope to get coherent email communications from students. And, I do expect that email communication is treated with the same respect as a face to face visit during my office hours. Thus, I am always a little surprised (maybe frustrated), when I get incoherent emails from students that are written like a text between friends or emails that begin with my first name and are very casual.
No where on my course syllabus do I list my first name. I sign all of my emails and Moodle messages with my title of choice: Prof. A. I even explain during the first lecture that students can refer to me as Prof. A, Dr. A or use my entire last name. There are not invitations to mispronouncing my name! I don’t even go there. This post is part rant and reminder–until an instructor says you can call me by first name–always use the professional title.