The email sent out by yum-updatesd is a bit boring and gives very little
information about what is going to be updated.

Suggested patch to get things a bit more exciting:

--- /usr/libexec/yum-updatesd-helper.orig       2007-11-16 17:06:15.000000000 +0100
+++ /usr/libexec/yum-updatesd-helper    2007-11-16 17:40:09.000000000 +0100
@@ -24,6 +24,8 @@
 import smtplib
 from optparse import OptionParser
 from email.MIMEText import MIMEText
+import socket
+import rfc822
 
 
 import yum
@@ -147,18 +149,30 @@
             return
 
         output = """
-        Hi,
-        There are %d package updates available. Please run the system
-        updater.
-        
-        Thank You,
-        Your Computer
-        """ % num
+Hi,
+This is the automatic update system on %s.
+
+There are %d package updates available. Please run the system
+updater.
+
+Packages available for update:
+
+""" % (socket.gethostname(), num)
+
+        for package in updateInfo:
+            output += "    %-30s %-10s\n" % (package[0]['name'],
package[0]['type'])
+
+        output += """
+
+Thank You,
+Your Computer
+"""
                 
         msg = MIMEText(output)
-        msg['Subject'] = "%d Updates Available" %(num,)
+        msg['Subject'] = "%d Updates Available on %s" %(num, socket.gethostname())
         msg['From'] = self.sender
         msg['To'] = self.rcpts
+        msg['Date'] = rfc822.formatdate()
         s = smtplib.SMTP()
         if self.smtp_server:
             s.connect(self.smtp_server)