Advice: Please sign your full name at the end of an email and consider a more detailed signature.
Why: When you send an email you want the recipient to know who you are. If you don’t sign your name then the recipient needs to try and figure out who you are. Sometimes this can be done by looking at the email address but not always. Also, don’t just use your first name since that may not uniquely identify you. Professors know lots of students from numerous classes and you probably aren’t the only Tom that the faculty member knows. You might also include a signature file that says more about you, such as your class year and major. Professionals today have detailed signature files, automatically included when they draft an email, and so pay attention to these as you think of what you should include.