diff --git a/conf/development.ini.sample b/conf/development.ini.sample
index 924cbee..94fbd7c 100644
--- a/conf/development.ini.sample
+++ b/conf/development.ini.sample
@@ -523,7 +523,7 @@ webdav.ui.enabled = True
 ####
 
 ## send some notification when user make specific action in Tracim
-; email.notification.activated = True
+email.notification.activated = True
 ## you can enable or disable if invited user to space will be notified
 ## on this space by default.
 ## NB: new users will not being notified until they login to Tracim a first time
@@ -544,10 +544,16 @@ email.notification.smtp.port = 25
 # email.notification.smtp.user = your_smtp_user
 # email.notification.smtp.password = your_smtp_password
 
-# enable implicit ssl if you are using implicit smtp with encryption port like 465
-# by default, Tracim will try to use explicit smtp encryption using starttls, and unencrypted
-# connection as fallback.
-; email.notification.smtp.use_implicit_ssl = False
+# Enable/disable authentification.
+# False mean anonymous smtp connection, it skip user/password login step.
+email.notification.smtp.authentication = False
+
+# SMTP encryption method valid values are:
+# - default: use smtp encryption using starttls, and unencrypted connection as fallback.
+# - SMTPS: use encrypted connection directly on port like 465
+# - unsecure: don't use encryption, use it with caution !
+# default value: default
+email.notification.smtp.encryption = unsecure
 
 ### Headers ###
 ; email.notification.from.default_label = Tracim Notifications