diff --git a/hgext/notify.py b/hgext/notify.py
--- a/hgext/notify.py
+++ b/hgext/notify.py
@@ -134,6 +134,9 @@ web.baseurl
 '''
 
 import email, socket, time
+# On python2.4 you have to import this by name or they fail to
+# load. This was not a problem on Python 2.7.
+import email.Parser
 from mercurial.i18n import _
 from mercurial import patch, cmdutil, templater, util, mail
 import fnmatch
diff --git a/hgext/patchbomb.py b/hgext/patchbomb.py
--- a/hgext/patchbomb.py
+++ b/hgext/patchbomb.py
@@ -47,6 +47,11 @@ hgrc(5) for details.
 
 import os, errno, socket, tempfile, cStringIO
 import email
+# On python2.4 you have to import these by name or they fail to
+# load. This was not a problem on Python 2.7.
+import email.Generator
+import email.MIMEMultipart
+
 from mercurial import cmdutil, commands, hg, mail, patch, util
 from mercurial import scmutil
 from mercurial.i18n import _
diff --git a/mercurial/mail.py b/mercurial/mail.py
--- a/mercurial/mail.py
+++ b/mercurial/mail.py
@@ -9,6 +9,10 @@ from i18n import _
 import util, encoding, sslutil
 import os, smtplib, socket, quopri, time, sys
 import email
+# On python2.4 you have to import these by name or they fail to
+# load. This was not a problem on Python 2.7.
+import email.Header
+import email.MIMEText
 
 _oldheaderinit = email.Header.Header.__init__
 def _unifiedheaderinit(self, *args, **kw):
diff --git a/mercurial/patch.py b/mercurial/patch.py
--- a/mercurial/patch.py
+++ b/mercurial/patch.py
@@ -8,6 +8,10 @@
 
 import cStringIO, email, os, errno, re, posixpath
 import tempfile, zlib, shutil
+# On python2.4 you have to import these by name or they fail to
+# load. This was not a problem on Python 2.7.
+import email.Generator
+import email.Parser
 
 from i18n import _
 from node import hex, nullid, short