diff --git a/gitlab/gitlab.rb b/gitlab/gitlab.rb
index 8c9e7b5..7929557 100644
--- a/gitlab/gitlab.rb
+++ b/gitlab/gitlab.rb
@@ -639,6 +639,7 @@ gitlab_rails['smtp_user_name'] = 'postmaster@mg.devops-lyon.eu'
 gitlab_rails['smtp_password'] = '2b074061f7fcc2562af5e8002a246abf-9a235412-23599447'
 gitlab_rails['smtp_domain'] = 'mg.devops-lyon.eu'
 gitlab_rails['smtp_enable_starttls_auto'] = true
+gitlab_rails['smtp_authentication'] = "login"
 
 ###! **Can be: 'none', 'peer', 'client_once', 'fail_if_no_peer_cert'**
 ###! Docs: http://api.rubyonrails.org/classes/ActionMailer/Base.html