Chances are high that you will, at some point, receive an email that begins with 'Hey', or that contains numerous misspellings or text abbreviations, or that has no identifying information (since you will have no idea who "hotgirl47@yahoo.com" is). While some faculty find this rude or frustrating, keep in mind that students may never have been informed that this is inappropriate for communication with a professor. You can help them develop their professional skills by clearly stating your expectations. Here are some ideas of what you might include in your syllabus about how you will communicate and how you would like them to communicate with you.

General communication policy: "Communication is extremely important in this course. Please treat all course communication as professional communication. Address your emails appropriately, check your spelling, use correct grammar and sign your name. When posting to discussion boards or commenting on others' writing, grammar and a professional tone are expected."
My office location is xxx (619-594-xxxx). You will find me there for office hours on Tuesdays & Thursdays 9:00am and 10:00 am. I will also be in our Zoom room for virtual meetings during this time. We can also schedule an appointment at a different time. Just ask.

The best way to reach me is via email: XXX@sdsu.edu. Because I teach multiple classes, please put your full name, course number and section time in the subject line of any messages.
All course materials and updates will be available in Canvas. I may also contact you via your campus email, so please check that daily.
I will typically respond to student emails Monday through Friday, 8:00am – 5:00pm. Messages that arrive outside these times will receive responses the next business day.
Students are welcome to address me as xxx. I look forward to working with you!

If you’ll be facilitating online discussion or activities with your class, you may also wish to share online etiquette (also known as netiquette) expectations. Here are some sample Netiquette Guidelines for your reference.