I expect to know to whom I am speaking; if your mail program does not include your real name in your message headers, please state it in the message body (first and last name).
If you are asking for an explanation of compiler error messages or making similar detailed reference to your program, please be sure to include enough of the program for me to be able to diagnose the situation. It is okay to include 50 or 100 lines of code in your e-mail message if applicable. Please copy it into the message body rather than sending it as a separate attachment.
Do not send HTML e-mail. See http://www.expita.com/nomime.html for an explanation and for advice on disabling HTML transmission in a variety of mail programs.