Write some Software

We require a small program that will monitor all incoming connections on a Windows 2003 mail server. The program should write to a simple text file all the incoming IP addresses that make an incoming connection to our server using port 587. The end result log file will be a simple text file with a list of IP addresses that connected using port 587. Because of the secure nature of the server, we are unable to give access to the server, but will perform the testing for the successful Freelancer.