//------------
// Introduction to Programming Using Java: An Object-Oriented Approach
//Arnow/Weiss
//------------
// the MailClient class
// Chapter 14, NET Supplement, Page 707-708

class MailClient {
public MailClient(String to, String from) throws Exception {
int    atInTo  =  to.indexOf("@"); 
int    atInFrom  =  from.indexOf("@"); 
String serverHost  = to.substring(atInTo+1);
String senderHost  = from.substring(atInFrom+1);
String recipient = to.substring(0,atInTo);
tc = new TCPConnection(serverHost, 25); 
println("EHLO "+senderHost); 
println("MAIL From: <"+from+">"); 
println("RCPT To: <"+to+">"); 
println("DATA"); 
}

public boolean success() throws Exception {
String s  =  tc.readLine();
while  (s!=null  &&  !s.substring(0,1).equals("5"))
{
System.out.println(s);
s = tc.readLine();
}
return  s==null; 
}

public void println(String s) {
tc.println(s);
}

public void close() {
println("\n.\nQUIT");
}

private TCPConnection tc;

public static void main(String[] a) throws Exception {
MailClient mc = new MailClient(a[0],a[1]);
mc.println("Subject: test message!");
mc.println("Just let me know if you received this. Thanks!");
mc.close();
if (mc.success())
System.out.println("mail success");
else
System.out.println("mail failure");
}
}