diff --git a/core/admin/mailu/__init__.py b/core/admin/mailu/__init__.py
index 5bb40447..3b88024f 100644
--- a/core/admin/mailu/__init__.py
+++ b/core/admin/mailu/__init__.py
@@ -57,6 +57,7 @@ def create_app_from_config(config):
         return dict(
             signup_domains= signup_domains,
             config        = app.config,
+            get_locale    = utils.get_locale,
         )
 
     # Jinja filters
diff --git a/core/admin/mailu/sso/templates/base_sso.html b/core/admin/mailu/sso/templates/base_sso.html
index 9dfb25a5..6d196d6a 100644
--- a/core/admin/mailu/sso/templates/base_sso.html
+++ b/core/admin/mailu/sso/templates/base_sso.html
@@ -1,7 +1,7 @@
 {%- import "macros.html" as macros %}
 {%- import "bootstrap/utils.html" as utils %}
 <!doctype html>
-<html lang="{{ session['language'] }}" data-static="/static/">
+<html lang="{{ get_locale() }}" data-static="/static/">
   <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
@@ -34,8 +34,8 @@
         <ul class="navbar-nav ml-auto">
           <li class="nav-item dropdown">
             <a class="nav-link" data-toggle="dropdown" href="#" aria-expanded="false">
-              <i class="fas fa-language text-xl" aria-hidden="true" title="{% trans %}change language{% endtrans %}"></i><span class="sr-only">Language</span>
-              <span class="badge badge-primary navbar-badge">{{ session['language'] }}</span></a>
+              <i class="fas fa-language text-xl" aria-hidden="true" title="{% trans %}change language{% endtrans %}"></i><span class="sr-only">{% trans %}change language{% endtrans %}</span>
+              <span class="badge badge-primary navbar-badge">{{ get_locale() }}</span></a>
             <div class="dropdown-menu dropdown-menu-right p-0" id="mailu-languages">
             {%- for locale in config.translations.values() %}
               <a class="dropdown-item{% if locale|string() == session['language'] %} active{% endif %}" href="{{ url_for('sso.set_language', language=locale) }}">{{ locale.get_language_name().title() }}</a>
diff --git a/core/admin/mailu/sso/templates/sidebar_sso.html b/core/admin/mailu/sso/templates/sidebar_sso.html
index 86db3333..0f75a1de 100644
--- a/core/admin/mailu/sso/templates/sidebar_sso.html
+++ b/core/admin/mailu/sso/templates/sidebar_sso.html
@@ -36,6 +36,12 @@
         </a>
       </li>
     {%- endif %}
+      <li class="nav-item" role="none">
+        <a href="{{ url_for('sso.login') }}" class="nav-link" role="menuitem">
+          <i class="nav-icon fas fa-sign-in-alt"></i>
+          <p>{% trans %}Sign in{% endtrans %}</p>
+        </a>
+      </li>
     {#-
       User self-registration is only available when
        - Admin is available
diff --git a/core/admin/mailu/ui/templates/admin/list.html b/core/admin/mailu/ui/templates/admin/list.html
index 84d954a0..e50c0ee6 100644
--- a/core/admin/mailu/ui/templates/admin/list.html
+++ b/core/admin/mailu/ui/templates/admin/list.html
@@ -14,7 +14,7 @@
 {%- call macros.table() %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
     <th>{% trans %}Email{% endtrans %}</th>
   </tr>
 </thead>
diff --git a/core/admin/mailu/ui/templates/alias/list.html b/core/admin/mailu/ui/templates/alias/list.html
index 1e66668e..833e44c1 100644
--- a/core/admin/mailu/ui/templates/alias/list.html
+++ b/core/admin/mailu/ui/templates/alias/list.html
@@ -16,7 +16,7 @@
 {%- call macros.table() %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
     <th>{% trans %}Email{% endtrans %}</th>
     <th>{% trans %}Destination{% endtrans %}</th>
     <th>{% trans %}Comment{% endtrans %}</th>
@@ -34,8 +34,8 @@
     <td>{{ alias }}</td>
     <td>{{ alias.destination|join(', ') or '-' }}</td>
     <td>{{ alias.comment or '' }}</td>
-    <td>{{ alias.created_at | format_date }}</td>
-    <td>{{ alias.updated_at | format_date }}</td>
+    <td data-sort="{{ alias.created_at or '0000-00-00' }}">{{ alias.created_at | format_date }}</td>
+    <td data-sort="{{ alias.updated_at or '0000-00-00' }}">{{ alias.updated_at | format_date }}</td>
   </tr>
   {%- endfor %}
 </tbody>
diff --git a/core/admin/mailu/ui/templates/alternative/list.html b/core/admin/mailu/ui/templates/alternative/list.html
index 4ca9f3c8..97482ac3 100644
--- a/core/admin/mailu/ui/templates/alternative/list.html
+++ b/core/admin/mailu/ui/templates/alternative/list.html
@@ -16,7 +16,7 @@
 {%- call macros.table() %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
     <th>{% trans %}Name{% endtrans %}</th>
     <th>{% trans %}Created{% endtrans %}</th>
     <th>{% trans %}Last edit{% endtrans %}</th>
@@ -29,8 +29,8 @@
       <a href="{{ url_for('.alternative_delete', alternative=alternative.name) }}" title="{% trans %}Delete{% endtrans %}"><i class="fa fa-trash"></i></a>
     </td>
     <td>{{ alternative }}</td>
-    <td>{{ alternative.created_at | format_date }}</td>
-    <td>{{ alternative.updated_at | format_date }}</td>
+    <td data-sort="{{ alternative.created_at or '0000-00-00' }}">{{ alternative.created_at | format_date }}</td>
+    <td data-sort="{{ alternative.updated_at or '0000-00-00' }}">{{ alternative.updated_at | format_date }}</td>
   </tr>
   {%- endfor %}
 </tbody>
diff --git a/core/admin/mailu/ui/templates/base.html b/core/admin/mailu/ui/templates/base.html
index e646e579..2ab21492 100644
--- a/core/admin/mailu/ui/templates/base.html
+++ b/core/admin/mailu/ui/templates/base.html
@@ -1,7 +1,7 @@
 {%- import "macros.html" as macros %}
 {%- import "bootstrap/utils.html" as utils %}
 <!doctype html>
-<html lang="{{ session['language'] }}" data-static="/static/">
+<html lang="{{ get_locale() }}" data-static="/static/">
   <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
@@ -34,8 +34,8 @@
         <ul class="navbar-nav ml-auto">
           <li class="nav-item dropdown">
             <a class="nav-link" data-toggle="dropdown" href="#" aria-expanded="false">
-              <i class="fas fa-language text-xl" aria-hidden="true" title="{% trans %}change language{% endtrans %}"></i><span class="sr-only">Language</span>
-              <span class="badge badge-primary navbar-badge">{{ session['language'] }}</span></a>
+              <i class="fas fa-language text-xl" aria-hidden="true" title="{% trans %}change language{% endtrans %}"></i><span class="sr-only">{% trans %}change language{% endtrans %}</span>
+              <span class="badge badge-primary navbar-badge">{{ get_locale() }}</span></a>
             <div class="dropdown-menu dropdown-menu-right p-0" id="mailu-languages">
             {%- for locale in config.translations.values() %}
               <a class="dropdown-item{% if locale|string() == session['language'] %} active{% endif %}" href="{{ url_for('.set_language', language=locale) }}">{{ locale.get_language_name().title() }}</a>
diff --git a/core/admin/mailu/ui/templates/client.html b/core/admin/mailu/ui/templates/client.html
index bf0ba64e..fddbe0d2 100644
--- a/core/admin/mailu/ui/templates/client.html
+++ b/core/admin/mailu/ui/templates/client.html
@@ -9,7 +9,6 @@
 {%- endblock %}
 
 {%- block content %}
-<div>If you use an Apple device, <a href="/apple.mobileconfig">click here to autoconfigure it.</a></div>
 {%- call macros.table(title=_("Incoming mail"), datatable=False) %}
   <tbody>
     <tr>
@@ -59,4 +58,8 @@
     </tr>
   </tbody>
 {%- endcall %}
+<blockquote>
+  {% trans %}If you use an Apple device,{% endtrans %}
+  <a href="/apple.mobileconfig">{% trans %}click here to autoconfigure it.{% endtrans %}</a>
+</blockquote>
 {%- endblock %}
diff --git a/core/admin/mailu/ui/templates/domain/list.html b/core/admin/mailu/ui/templates/domain/list.html
index 61c09151..4889bc8d 100644
--- a/core/admin/mailu/ui/templates/domain/list.html
+++ b/core/admin/mailu/ui/templates/domain/list.html
@@ -11,15 +11,16 @@
 {%- endblock %}
 
 {%- block content %}
-{%- call macros.table() %}
+{%- call macros.table(order='[[2,"asc"]]') %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
-    <th>{% trans %}Manage{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Manage{% endtrans %}</th>
     <th>{% trans %}Domain name{% endtrans %}</th>
     <th>{% trans %}Mailbox count{% endtrans %}</th>
     <th>{% trans %}Alias count{% endtrans %}</th>
     <th>{% trans %}Comment{% endtrans %}</th>
+    <th>{% trans %}Enable sign-up{% endtrans %}</th>
     <th>{% trans %}Created{% endtrans %}</th>
     <th>{% trans %}Last edit{% endtrans %}</th>
   </tr>
@@ -43,11 +44,12 @@
       {%- endif %}
     </td>
     <td>{{ domain.name }}</td>
-    <td>{{ domain.users | count }} / {{ '∞' if domain.max_users == -1 else domain.max_users }}</td>
-    <td>{{ domain.aliases | count }} / {{ '∞' if domain.max_aliases == -1 else domain.max_aliases }}</td>
+    <td data-order="{{ domain.users | count }}">{{ domain.users | count }} / {{ '∞' if domain.max_users == -1 else domain.max_users }}</td>
+    <td data-order="{{ domain.aliases | count }}">{{ domain.aliases | count }} / {{ '∞' if domain.max_aliases == -1 else domain.max_aliases }}</td>
     <td>{{ domain.comment or '' }}</td>
-    <td>{{ domain.created_at | format_date }}</td>
-    <td>{{ domain.updated_at | format_date }}</td>
+    <td data-sort="{{ domain.signup_enabled }}">{% if domain.signup_enabled %}{% trans %}yes{% endtrans %}{% else %}{% trans %}no{% endtrans %}{% endif %}</td>
+    <td data-order="{{ domain.created_at or '0000-00-00' }}">{{ domain.created_at | format_date }}</td>
+    <td data-order="{{ domain.updated_at or '0000-00-00' }}">{{ domain.updated_at | format_date }}</td>
   </tr>
   {%- endfor %}
 </tbody>
diff --git a/core/admin/mailu/ui/templates/fetch/list.html b/core/admin/mailu/ui/templates/fetch/list.html
index a504b7a2..7a527ce8 100644
--- a/core/admin/mailu/ui/templates/fetch/list.html
+++ b/core/admin/mailu/ui/templates/fetch/list.html
@@ -16,7 +16,7 @@
 {%- call macros.table() %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
     <th>{% trans %}Endpoint{% endtrans %}</th>
     <th>{% trans %}Username{% endtrans %}</th>
     <th>{% trans %}Keep emails{% endtrans %}</th>
@@ -35,11 +35,11 @@
     </td>
     <td>{{ fetch.protocol }}{{ 's' if fetch.tls else '' }}://{{ fetch.host }}:{{ fetch.port }}</td>
     <td>{{ fetch.username }}</td>
-    <td>{% if fetch.keep %}{% trans %}yes{% endtrans %}{% else %}{% trans %}no{% endtrans %}{% endif %}</td>
+    <td data-sort="{{ fetch.keep }}">{% if fetch.keep %}{% trans %}yes{% endtrans %}{% else %}{% trans %}no{% endtrans %}{% endif %}</td>
     <td>{{ fetch.last_check | format_datetime or '-' }}</td>
     <td>{{ fetch.error or '-' }}</td>
-    <td>{{ fetch.created_at | format_date }}</td>
-    <td>{{ fetch.updated_at | format_date }}</td>
+    <td data-sort="{{ fetch.created_at or '0000-00-00' }}">{{ fetch.created_at | format_date }}</td>
+    <td data-sort="{{ fetch.updated_at or '0000-00-00' }}">{{ fetch.updated_at | format_date }}</td>
   </tr>
   {%- endfor %}
 </tbody>
diff --git a/core/admin/mailu/ui/templates/macros.html b/core/admin/mailu/ui/templates/macros.html
index 46a76991..90084246 100644
--- a/core/admin/mailu/ui/templates/macros.html
+++ b/core/admin/mailu/ui/templates/macros.html
@@ -86,7 +86,7 @@
 </div>
 {%- endmacro %}
 
-{%- macro table(title=None, theme="primary", datatable=True) %}
+{%- macro table(title=None, theme="primary", datatable=True, order=None) %}
 <div class="row">
   <div class="col-lg-12">
     <div class="card card-outline card-{{ theme }}">
@@ -96,7 +96,7 @@
       </div>
       {%- endif %}
       <div class="card-body">
-        <table class="table table-bordered{% if datatable %} dataTable{% endif %}">
+        <table class="table table-bordered{% if datatable %} dataTable{% endif %}" data-order="{{ order or '[]' | e }}">
           {{- caller() }}
         </table>
       </div>
diff --git a/core/admin/mailu/ui/templates/manager/list.html b/core/admin/mailu/ui/templates/manager/list.html
index 706594c4..95dc9f4a 100644
--- a/core/admin/mailu/ui/templates/manager/list.html
+++ b/core/admin/mailu/ui/templates/manager/list.html
@@ -13,10 +13,10 @@
 {%- endblock %}
 
 {%- block content %}
-{%- call macros.table() %}
+{%- call macros.table(order='[[2,"asc"]]') %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
     <th>{% trans %}Email{% endtrans %}</th>
   </tr>
 </thead>
diff --git a/core/admin/mailu/ui/templates/relay/list.html b/core/admin/mailu/ui/templates/relay/list.html
index 1a23ee12..90d13e11 100644
--- a/core/admin/mailu/ui/templates/relay/list.html
+++ b/core/admin/mailu/ui/templates/relay/list.html
@@ -11,10 +11,10 @@
 {%- endblock %}
 
 {%- block content %}
-{%- call macros.table() %}
+{%- call macros.table(order='[[1,"asc"]]') %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
     <th>{% trans %}Domain name{% endtrans %}</th>
     <th>{% trans %}Remote host{% endtrans %}</th>
     <th>{% trans %}Comment{% endtrans %}</th>
@@ -32,8 +32,8 @@
     <td>{{ relay.name }}</td>
     <td>{{ relay.smtp or '-' }}</td>
     <td>{{ relay.comment or '' }}</td>
-    <td>{{ relay.created_at | format_date }}</td>
-    <td>{{ relay.updated_at | format_date }}</td>
+    <td data-sort="{{ relay.created_at or '0000-00-00' }}">{{ relay.created_at | format_date }}</td>
+    <td data-sort="{{ relay.updated_at or '0000-00-00' }}">{{ relay.updated_at | format_date }}</td>
   </tr>
   {%- endfor %}
 </tbody>
diff --git a/core/admin/mailu/ui/templates/token/list.html b/core/admin/mailu/ui/templates/token/list.html
index d7c48737..a6eee9c3 100644
--- a/core/admin/mailu/ui/templates/token/list.html
+++ b/core/admin/mailu/ui/templates/token/list.html
@@ -16,7 +16,7 @@
 {%- call macros.table() %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
     <th>{% trans %}Comment{% endtrans %}</th>
     <th>{% trans %}Authorized IP{% endtrans %}</th>
     <th>{% trans %}Created{% endtrans %}</th>
@@ -31,8 +31,8 @@
     </td>
     <td>{{ token.comment }}</td>
     <td>{{ token.ip or "any" }}</td>
-    <td>{{ token.created_at | format_date }}</td>
-    <td>{{ token.updated_at | format_date }}</td>
+    <td data-sort="{{ token.created_at or '0000-00-00' }}">{{ token.created_at | format_date }}</td>
+    <td data-sort="{{ token.updated_at or '0000-00-00' }}">{{ token.updated_at | format_date }}</td>
   </tr>
   {%- endfor %}
 </tbody>
diff --git a/core/admin/mailu/ui/templates/user/list.html b/core/admin/mailu/ui/templates/user/list.html
index 7faddab5..14626212 100644
--- a/core/admin/mailu/ui/templates/user/list.html
+++ b/core/admin/mailu/ui/templates/user/list.html
@@ -16,8 +16,8 @@
 {%- call macros.table() %}
 <thead>
   <tr>
-    <th>{% trans %}Actions{% endtrans %}</th>
-    <th>{% trans %}User settings{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}Actions{% endtrans %}</th>
+    <th data-orderable="false">{% trans %}User settings{% endtrans %}</th>
     <th>{% trans %}Email{% endtrans %}</th>
     <th>{% trans %}Features{% endtrans %}</th>
     <th>{% trans %}Quota{% endtrans %}</th>
@@ -39,14 +39,14 @@
       <a href="{{ url_for('.fetch_list', user_email=user.email) }}" title="{% trans %}Fetched accounts{% endtrans %}"><i class="fa fa-download"></i></a>&nbsp;
     </td>
     <td>{{ user }}</td>
-    <td>
+    <td data-sort="{{ user.enable_imap*2 + user.enable_pop }}">
       {% if user.enable_imap %}<span class="badge bg-info">imap</span>{% endif %}
       {% if user.enable_pop %}<span class="badge bg-info">pop3</span>{% endif %}
     </td>
-    <td>{{ user.quota_bytes_used | filesizeformat }} / {{ (user.quota_bytes | filesizeformat) if user.quota_bytes else '∞' }}</td>
+    <td data-sort="{{ user.quota_bytes_used }}">{{ user.quota_bytes_used | filesizeformat }} / {{ (user.quota_bytes | filesizeformat) if user.quota_bytes else '∞' }}</td>
     <td>{{ user.comment or '-' }}</td>
-    <td>{{ user.created_at | format_date }}</td>
-    <td>{{ user.updated_at | format_date }}</td>
+    <td data-sort="{{ user.created_at or '0000-00-00' }}">{{ user.created_at | format_date }}</td>
+    <td data-sort="{{ user.updated_at or '0000-00-00' }}">{{ user.updated_at | format_date }}</td>
   </tr>
   {%- endfor %}
 </tbody>
diff --git a/core/admin/mailu/ui/templates/user/signup_domain.html b/core/admin/mailu/ui/templates/user/signup_domain.html
index a7db4c97..519f73ed 100644
--- a/core/admin/mailu/ui/templates/user/signup_domain.html
+++ b/core/admin/mailu/ui/templates/user/signup_domain.html
@@ -9,18 +9,22 @@
 {%- endblock %}
 
 {%- block content %}
-{%- call macros.table() %}
-<tr>
-  <th>{% trans %}Domain{% endtrans %}</th>
-  <th>{% trans %}Available slots{% endtrans %}</th>
-  <th>{% trans %}Quota{% endtrans %}</th>
-</tr>
+{%- call macros.table(order='[[1,"asc"]]') %}
+<thead>
+  <tr>
+    <th>{% trans %}Domain{% endtrans %}</th>
+    <th>{% trans %}Available slots{% endtrans %}</th>
+    <th>{% trans %}Quota{% endtrans %}</th>
+  </tr>
+</thead>
+<tbody>
 {%- for domain_name, domain in available_domains.items() %}
 <tr>
   <td><a href="{{ url_for('.user_signup', domain_name=domain_name) }}">{{ domain_name }}</a></td>
-  <td>{{ '∞' if domain.max_users == -1 else domain.max_users - (domain.users | count)}}</td>
-  <td>{{ domain.max_quota_bytes or config['DEFAULT_QUOTA'] | filesizeformat }}</td>
+  <td data-sort="{{ -1 if domain.max_users == -1 else domain.max_users - (domain.users | count)}}">{{ '∞' if domain.max_users == -1 else domain.max_users - (domain.users | count)}}</td>
+  <td data-sort="{{ domain.max_quota_bytes or config['DEFAULT_QUOTA'] }}">{{ domain.max_quota_bytes or config['DEFAULT_QUOTA'] | filesizeformat }}</td>
 </tr>
 {%- endfor %}
+</tbody>
 {%- endcall %}
 {%- endblock %}
