erp5_interface_post: never retries the activity interacting with MailHost

bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/ERP5Site_sendMailHostMessage.py

+# As a general rule, sending messages by MailHost should
+# be done in an activity context that never retry.
+# We do so because MailHost isn't transactional as the zodb.
+# This script should then always be called in an activity
+# spawned with parameters :
+#     conflict_retry=False,
+#     max_retry=0,
+
+context.getPortalObject().MailHost.send(data)

bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/ERP5Site_sendMailHostMessage.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="PythonScript" module="Products.PythonScripts.PythonScript"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>Script_magic</string> </key>
+            <value> <int>3</int> </value>
+        </item>
+        <item>
+            <key> <string>_bind_names</string> </key>
+            <value>
+              <object>
+                <klass>
+                  <global name="NameAssignments" module="Shared.DC.Scripts.Bindings"/>
+                </klass>
+                <tuple/>
+                <state>
+                  <dictionary>
+                    <item>
+                        <key> <string>_asgns</string> </key>
+                        <value>
+                          <dictionary>
+                            <item>
+                                <key> <string>name_container</string> </key>
+                                <value> <string>container</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_context</string> </key>
+                                <value> <string>context</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_m_self</string> </key>
+                                <value> <string>script</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_subpath</string> </key>
+                                <value> <string>traverse_subpath</string> </value>
+                            </item>
+                          </dictionary>
+                        </value>
+                    </item>
+                  </dictionary>
+                </state>
+              </object>
+            </value>
+        </item>
+        <item>
+            <key> <string>_params</string> </key>
+            <value> <string>data</string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>ERP5Site_sendMailHostMessage</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>

bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/InternetMessagePost_export.py

-context.getPortalObject().MailHost.send(context.getData())
+# calling ERP5Site_sendMailHostMessage should be done in an activity
+# which NEVER retries.
+
+# internet_message_post_module because we need an object supporting
+# the activate method
+context.getPortalObject().internet_message_post_module.activate(
+  activity='SQLQueue',
+  conflict_retry=False,
+  max_retry=0,
+).ERP5Site_sendMailHostMessage(context.getData())