Issues with Assignment#1

Apparently there are some difficult statements on the assignment text (given the submissions I'm getting). Let me repeat some of them here (pasted from original document, boldface added here):

1. Please include a MANDATORY comment on the source code with your name.
2. Please send me the java source code file by email to the email account shown here with
   EXACTLY the subject: Assignment#1
3. Each time your server receives a message it will write it down to a text file named "received.txt".
4. Main class name MUST BE SmtpServer.

In case you have not noticed it, I was using UPPER CASE to remark that these were IMPORTANT information.