Try email_to_address to get the default email address.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5106 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/CMFActivity/ActivityTool.py

@@ -162,7 +162,7 @@ class Message:
     #LOG('notifyUser begin', 0, str(self.user_name))
     user_email = activity_tool.portal_membership.getMemberById(self.user_name).getProperty('email')
     if user_email in ('', None):
-      user_email = activity_tool.email_from_address
+      user_email = getattr(activity_tool, 'email_to_address', activity_tool.email_from_address)
     #LOG('notifyUser user_email', 0, str(user_email))
     mail_text = """From: %s
 To: %s