diff --git a/group_vars/horde.yml b/group_vars/horde.yml
index 3b624d16..f6b1d708 100644
--- a/group_vars/horde.yml
+++ b/group_vars/horde.yml
@@ -2,16 +2,9 @@
 glob_horde:
   secret: '{{ vault.horde.secret }}'
   imap: imap.adm.crans.org
-  smtp: smtp.adm.crans.org
   maildomain: crans.org
   db: pgsql.adm.crans.org
-  admins:
-    - "'paulon'"
-    - "'vulcain'"
-    - "'graillot'"
-    - "'bombar'"
-    - "'pa'"
-    - "'erdnaxe'"
+  admins: "{{ vault.horde.admins }}"
   redirection: https://wiki.crans.org/VieCrans/PagesDeDeconnexion/ERR_CHOOSE_WEBMAIL
   src_hostname: horde.crans.org
   dest_hostname: webmail.crans.org
@@ -21,3 +14,5 @@ glob_horde:
   zone_ipv6: fd00:0:0:10::/64
   ipv4: "{{ query('ldap', 'ip4', ansible_hostname, 'adm') }}"
   ipv6: "{{ query('ldap', 'ip6', ansible_hostname, 'adm') }}"
+  mailer:
+    host: redisdead.adm.crans.org
diff --git a/roles/horde/templates/horde/horde/conf.php.j2 b/roles/horde/templates/horde/horde/conf.php.j2
index 1c6c5018..70c01f61 100644
--- a/roles/horde/templates/horde/horde/conf.php.j2
+++ b/roles/horde/templates/horde/horde/conf.php.j2
@@ -88,9 +88,12 @@ $conf['history']['params']['driverconfig'] = 'horde';
 $conf['history']['driver'] = 'Sql';
 $conf['davstorage']['params']['driverconfig'] = 'horde';
 $conf['davstorage']['driver'] = 'Sql';
-$conf['mailer']['params']['sendmail_path'] = '/usr/lib/sendmail';
-$conf['mailer']['params']['sendmail_args'] = '-oi';
-$conf['mailer']['type'] = 'sendmail';
+$conf['mailer']['type'] = 'smtp';
+$conf['mailer']['params']['host'] = '{{ horde.mailer.host }}';
+$conf['mailer']['params']['port'] = 587;
+$conf['mailer']['params']['auth'] = true;
+$conf['mailer']['params']['username_auth'] = true;
+$conf['mailer']['params']['password_auth'] = true;
 $conf['vfs']['params']['driverconfig'] = 'horde';
 $conf['vfs']['type'] = 'Sql';
 $conf['sessionhandler']['type'] = 'Builtin';
diff --git a/roles/horde/templates/horde/imp/backends.php.j2 b/roles/horde/templates/horde/imp/backends.php.j2
index cac5f915..c61d2ab3 100644
--- a/roles/horde/templates/horde/imp/backends.php.j2
+++ b/roles/horde/templates/horde/imp/backends.php.j2
@@ -1,6 +1,6 @@
 {{ ansible_header | comment(decoration='// ') }}
 <?php
-$servers['imp'] = array(
+$servers['advanced'] = array(
     // Disabled by default
     'disabled' => false,
     'name' => 'IMAP Cr@ns',
@@ -11,8 +11,10 @@ $servers['imp'] = array(
     'secure' => 'tls',
     'maildomain' => '{{ horde.maildomain }}',
     'smtp' => array(
-        'host' => '{{ horde.smtp }}',
-        'port' => 25,
+        'auth' => true,
+        'horde_auth' => true,
+        'host' => '{{ horde.mailer.host }}',
+        'port' => 587,
     ),
     'cache' => false,
 );