Index: src/zope/sendmail/zcml.py
===================================================================
--- src/zope/sendmail/zcml.py	(revision 83753)
+++ src/zope/sendmail/zcml.py	(working copy)
@@ -88,7 +88,7 @@
         thread.start()
 
     _context.action(
-            discriminator = ('delivery', name),
+            discriminator = ('utility', IMailDelivery, name),
             callable = createQueuedDelivery,
             args = () )