Index: mailer.py
===================================================================
--- mailer.py	(revision 1447514)
+++ mailer.py	(working copy)
@@ -237,6 +237,7 @@
       self.reply_to = self.reply_to[3:]
 
   def mail_headers(self, group, params):
+    from email import Utils
     subject = self.make_subject(group, params)
     try:
       subject.encode('ascii')
@@ -246,6 +247,8 @@
     hdrs = 'From: %s\n'    \
            'To: %s\n'      \
            'Subject: %s\n' \
+           'Date: %s\n' \
+           'Message-ID: %s\n' \
            'MIME-Version: 1.0\n' \
            'Content-Type: text/plain; charset=UTF-8\n' \
            'Content-Transfer-Encoding: 8bit\n' \
@@ -253,7 +256,8 @@
            'X-Svn-Commit-Author: %s\n' \
            'X-Svn-Commit-Revision: %d\n' \
            'X-Svn-Commit-Repository: %s\n' \
-           % (self.from_addr, ', '.join(self.to_addrs), subject,
+           % (self.from_addr, ', '.join(self.to_addrs), subject, 
+              Utils.formatdate(), Utils.make_msgid("r" + str(self.repos.rev)),
               group, self.repos.author or 'no_author', self.repos.rev,
               os.path.basename(self.repos.repos_dir))
     if self.reply_to: