Common Mistakes That Students Make When Using Email At University.

The following is a list of email issues to AVOID! 

• no subject
• spelling mistakes
• incorrect or missing punctuation
• missing upper-case letters
• incorrect layout - no paragraphs
• 'flaming' - sending a rude or aggressive e-mail
• inappropriate use of the student mail system
• poor communication through not checking e-mail every day
• inappropriate tone - too informal to send to a member of staff
• using 'text' language

Below is an example of s student who sent a "flaming" email, with inappropriate tone and incorrect punctuation to a professor. This student clearly didn't read the 7 C's of Communication, # 7) Be courteous, nor did this student do a proper audience analysis - the instructor most likely did not respond in favor to the student's request. 

When I receive an email in all capitals, I assume the person is yelling at me and therefore, I delete the email without reading it. If it's that important they will yell at me in person or on the phone - I am a tough audience who prefers polite email communication versus people who are too lazy to switch between lower-case and upper-case words. 

"To: paul.jones@ABC.ac.uk
Subject: UNFAIR ASSIGNMENT MARK
DR JONES
I AM REALLY ANNOYED WITH THE MARK YOU GAVE MY ASSIGNMENT. I WORKED FOR DAYS ON THAT AND I CANNOT BELIEVE YOU ONLY GAVE IT 58%. I KNOW YOU DON'T LIKE IT WHEN STUDENTS DISAGREE WITH YOUR NARROW WORLD VIEW AND THAT IS WHY YOU GAVE ME A BAD MARK. THIS IS A RUBBISH UNIVERSITY THAT DOES NOTHING TO HELP ITS STUDENTS AND MY DAD SAYS YOU WOULD NOT GET A JOB IN THE REAL WORLD.
I DEMAND THAT YOU GET SOMEONE ELSE TO MARK THIS ESSAY WHO ACTUALLY KNOWS SOMETHING ABOUT THE TOPIC.
ROB HALL"

http://www.mondofacto.com/study-skills/personal/how-to-write-professional-email/01.html