Which of these items would make an email to a professor look unprofessional?

Using abbreviated texting language in an email to a professor undermines the professionalism expected in academic communications. This style of writing is often too casual and may come across as disrespectful or careless, detracting from the seriousness of the message.

Professional emails typically follow a formal structure, which includes a clear, respectful tone and proper language. Such a tone reflects the sender's respect for the recipient and their position. Items like formal greetings and closings, detailed subject lines, and well-organized content contribute positively to the impression a student makes. Abbreviations and slang, in contrast, can create a negative perception and may lead to misunderstandings about the purpose or seriousness of the communication.