#! perl -w
# fn_with_me.pl
# A quick and dirty way to tell if someone is messing with My Computer
+s
use Net::SMTP;
use Sys::Hostname;
use Win32;

$host = hostname;
$user = Win32::LoginName();

$smtp = Net::SMTP -> new('your.mailhost.net'); #Connect to a mail serv
+er
$smtp -> mail( 'anysender@theirmailhost.net'); #Sender's name
$smtp -> to('myemail@mymailhost.net'); #Receivers name
$smtp -> data();

# Send the header
$smtp -> datasend("To:  myemail\@mymailhost.net\n");
$smtp -> datasend("From:  theiremail\@mymailhost.net\n");
$smtp -> datasend("\n");

# Send the Body
$smtp -> datasend("$user is using $host");
$smtp -> dataend();
$smtp -> quit;
[download]

Thanks for the comment. I've inherited this system from a previous sysadmin and his policy was very loose. Once I implement my new security measures, I'll be able to extract the user name from their login. When I fix the code, I'll repost.