^D means EOF on Unix but not on Windows. Expand the example's prompt to

tell Windows Truth too.

Bugfix candidate.

Doc/lib/libsmtplib.tex

@@ -50,7 +50,7 @@ A nice selection of exceptions is defined as well:
 \end{excdesc}
 
 \begin{excdesc}{SMTPSenderRefused}
-  Sender address refused.  In addition to the attributes set by on all 
+  Sender address refused.  In addition to the attributes set by on all
   \exception{SMTPResponseException} exceptions, this sets `sender' to
   the string that the SMTP server refused.
 \end{excdesc}
@@ -98,10 +98,10 @@ received from the server.
 \end{methoddesc}
 
 \begin{methoddesc}{connect}{\optional{host\optional{, port}}}
-Connect to a host on a given port.  The defaults are to connect to the 
+Connect to a host on a given port.  The defaults are to connect to the
 local host at the standard SMTP port (25).
 If the hostname ends with a colon (\character{:}) followed by a
-number, that suffix will be stripped off and the number interpreted as 
+number, that suffix will be stripped off and the number interpreted as
 the port number to use.
 This method is automatically invoked by the constructor if a
 host is specified during instantiation.
@@ -257,7 +257,7 @@ consult the module code.
 
 This example prompts the user for addresses needed in the message
 envelope (`To' and `From' addresses), and the message to be
-delivered.  Note that the headers to be included with the message must 
+delivered.  Note that the headers to be included with the message must
 be included in the message as entered; this example doesn't do any
 processing of the \rfc{822} headers.  In particular, the `To' and
 `From' addresses must be included in the message headers explicitly.
@@ -271,7 +271,7 @@ def prompt(prompt):
 
 fromaddr = prompt("From: ")
 toaddrs  = prompt("To: ").split()
-print "Enter message, end with ^D:"
+print "Enter message, end with ^D (Unix) or ^Z (Windows):"
 
 # Add the From: and To: headers at the start!
 msg = ("From: %s\r\nTo: %s\r\n\r\n"