diff --git a/hgext/notify.py b/hgext/notify.py
--- a/hgext/notify.py
+++ b/hgext/notify.py
@@ -70,7 +70,7 @@ can push changes to, they can manage the
 
 from mercurial.i18n import _
 from mercurial import patch, cmdutil, templater, util, mail
-import email.Parser, fnmatch, socket, time
+import email.Parser, email.Errors, fnmatch, socket, time
 
 # template for single changeset can include email headers.
 single_template = '''
@@ -180,20 +180,25 @@ class notifier(object):
         '''send message.'''
 
         p = email.Parser.Parser()
-        msg = p.parsestr(data)
+        try:
+            msg = p.parsestr(data)
+        except email.Errors.MessageParseError, inst:
+            raise util.Abort(inst)
 
         # store sender and subject
         sender, subject = msg['From'], msg['Subject']
         del msg['From'], msg['Subject']
-        # store remaining headers
-        headers = msg.items()
-        # create fresh mime message from msg body
-        text = msg.get_payload()
-        # for notification prefer readability over data precision
-        msg = mail.mimeencode(self.ui, text, self.charsets, self.test)
-        # reinstate custom headers
-        for k, v in headers:
-            msg[k] = v
+
+        if not msg.is_multipart():
+            # create fresh mime message from scratch
+            # (multipart templates must take care of this themselves)
+            headers = msg.items()
+            payload = msg.get_payload()
+            # for notification prefer readability over data precision
+            msg = mail.mimeencode(self.ui, payload, self.charsets, self.test)
+            # reinstate custom headers
+            for k, v in headers:
+                msg[k] = v
 
         msg['Date'] = util.datestr(format="%a, %d %b %Y %H:%M:%S %1%2")
 
diff --git a/mercurial/demandimport.py b/mercurial/demandimport.py
--- a/mercurial/demandimport.py
+++ b/mercurial/demandimport.py
@@ -81,7 +81,10 @@ class _demandmod(object):
 def _demandimport(name, globals=None, locals=None, fromlist=None, level=None):
     if not locals or name in ignore or fromlist == ('*',):
         # these cases we can't really delay
-        return _origimport(name, globals, locals, fromlist)
+        if level is None:
+            return _origimport(name, globals, locals, fromlist)
+        else:
+            return _origimport(name, globals, locals, fromlist, level)
     elif not fromlist:
         # import a [as b]
         if '.' in name: # a.b
diff --git a/mercurial/lsprof.py b/mercurial/lsprof.py
--- a/mercurial/lsprof.py
+++ b/mercurial/lsprof.py
@@ -85,7 +85,7 @@ def label(code):
     try:
         mname = _fn2mod[code.co_filename]
     except KeyError:
-        for k, v in sys.modules.iteritems():
+        for k, v in list(sys.modules.iteritems()):
             if v is None:
                 continue
             if not hasattr(v, '__file__'):