diff --git a/composer/rule/base.py b/composer/rule/base.py
index ff89792..7227eb2 100644
--- a/composer/rule/base.py
+++ b/composer/rule/base.py
@@ -54,7 +54,7 @@ class RuleManager(object):
             entry.append(rule)
 
     def getRulesForEvent(self, event):
-        return self.rules.get(event.name, [])
+        return self.rules and self.rules.get(event.name, []) or []
 
     def handleEvent(self, event):
         result = []
@@ -86,16 +86,6 @@ class Rule(Template):
         self.actions = []
 
 
-class RuleInstance(object):
-
-    implements(IInstance)
-
-    template = None
-
-    def applyTemplate(self):
-        pass
-
-
 # events
 
 class EventType(object):
diff --git a/composer/rule/instance.py b/composer/rule/instance.py
index 7d2d319..b1961d0 100644
--- a/composer/rule/instance.py
+++ b/composer/rule/instance.py
@@ -35,6 +35,7 @@ class RuleInstance(Instance):
     implements(IRuleInstance)
     adapts(Interface)
 
+    template = None
     event = None
 
     def applyTemplate(self, **kw):
diff --git a/organize/browser/service.py b/organize/browser/service.py
index 7c69062..ef6f1ac 100644
--- a/organize/browser/service.py
+++ b/organize/browser/service.py
@@ -29,7 +29,10 @@ from zope.cachedescriptors.property import Lazy
 
 from cybertools.organize.interfaces import IClientRegistrations, IRegistrationTemplate
 from cybertools.organize.interfaces import serviceCategories
+from cybertools.organize.service import eventTypes, getCheckoutRule
 from cybertools.composer.interfaces import IInstance
+from cybertools.composer.rule.base import Event
+from cybertools.composer.rule.interfaces import IRuleManager
 from cybertools.composer.schema.browser.common import BaseView as SchemaBaseView
 from cybertools.composer.schema.interfaces import IClientFactory
 from cybertools.stateful.interfaces import IStateful
@@ -185,6 +188,9 @@ class CheckoutView(ServiceManagerView):
             stateful = IStateful(reg)
             stateful.doTransition(('submit', 'change'))
         # send mail
+        rm = IRuleManager(self.manager)
+        rm.addRule(getCheckoutRule(self.manager.senderEmail))
+        rm.handleEvent(Event(eventTypes['service.checkout'], client))
         # find thank you message and redirect to it
         params = '?message=thankyou&id=' + self.clientName
         self.request.response.redirect(self.url + '/checkout.html' + params)
diff --git a/organize/interfaces.py b/organize/interfaces.py
index 3ad1914..52aa4a1 100644
--- a/organize/interfaces.py
+++ b/organize/interfaces.py
@@ -256,6 +256,11 @@ class IService(Interface):
                 description=_(u'Web address (URL) for more information '
                         'about the service.'),
                 required=False,)
+    senderEmail = schema.TextLine(
+                title=_(u'Sender email'),
+                description=_(u'Email address that will be used as sender '
+                        'address of confirmation and feedback messages.'),
+                required=False,)
 
     availableCapacity = Attribute('Available capacity, i.e. number of seats '
                 'still available; a negative number means: '
diff --git a/organize/service.py b/organize/service.py
index ffa2e39..97196f9 100644
--- a/organize/service.py
+++ b/organize/service.py
@@ -33,6 +33,7 @@ from zope.interface import implements, Interface
 from cybertools.composer.interfaces import IInstance
 from cybertools.composer.message.base import MessageManager
 from cybertools.composer.rule.base import RuleManager, EventType
+from cybertools.composer.rule.base import Rule, Action
 from cybertools.composer.schema.interfaces import IClientManager, IClient
 from cybertools.stateful.base import StatefulAdapter
 from cybertools.stateful.definition import registerStatesDefinition
@@ -61,6 +62,7 @@ class ServiceManager(object):
 
     allowRegWithNumber = False
     allowDirectRegistration = True
+    senderEmail = 'unknown@sender.com'
 
     def __init__(self):
         if self.servicesFactory is not None:
@@ -121,7 +123,7 @@ class Service(object):
 
     manager = None
     category = None
-    location = ''
+    location = u''
     allowRegWithNumber = False
     allowDirectRegistration = True
 
@@ -378,6 +380,18 @@ class MessageManagerAdapter(MessageManager):
         return self.context.messages
 
 
+def getCheckoutRule(sender):
+    """ A rule for sending a confirmation message, provided by default.
+    """
+    checkoutRule = Rule('checkoutmail')
+    checkoutRule.events.append(eventTypes['service.checkout'])
+    checkoutRule.actions.append(Action('message',
+                      parameters=dict(messageName='feedback_text')))
+    checkoutRule.actions.append(Action('sendmail',
+                      parameters=dict(sender=sender)))
+    return checkoutRule
+
+
 # Zope event handlers
 
 def clientRemoved(obj, event):