diff --git a/Doc/includes/email-dir.py b/Doc/includes/email-dir.py
index e67de61..035442b 100644
--- a/Doc/includes/email-dir.py
+++ b/Doc/includes/email-dir.py
@@ -105,7 +105,7 @@
         fp.write(composed)
         fp.close()
     else:
-        s = smtplib.SMTP()
+        s = smtplib.SMTP('localhost')
         s.sendmail(opts.sender, opts.recipients, composed)
         s.quit()
 
diff --git a/Doc/includes/email-mime.py b/Doc/includes/email-mime.py
index f64df83..7b1c028 100644
--- a/Doc/includes/email-mime.py
+++ b/Doc/includes/email-mime.py
@@ -26,6 +26,6 @@
     msg.attach(img)
 
 # Send the email via our own SMTP server.
-s = smtplib.SMTP()
+s = smtplib.SMTP('localhost')
 s.sendmail(me, family, msg.as_string())
 s.quit()
diff --git a/Doc/includes/email-simple.py b/Doc/includes/email-simple.py
index 689511e..29bd078 100644
--- a/Doc/includes/email-simple.py
+++ b/Doc/includes/email-simple.py
@@ -19,6 +19,6 @@
 
 # Send the message via our own SMTP server, but don't include the
 # envelope header.
-s = smtplib.SMTP()
+s = smtplib.SMTP('localhost')
 s.sendmail(me, [you], msg.as_string())
 s.quit()