diff --git a/orchestra/contrib/bills/templates/bills/microspective.html b/orchestra/contrib/bills/templates/bills/microspective.html
index 86b1cbbf..98a9f4c8 100644
--- a/orchestra/contrib/bills/templates/bills/microspective.html
+++ b/orchestra/contrib/bills/templates/bills/microspective.html
@@ -27,7 +27,8 @@
         <span class="name">{{ seller.get_name }}</span>
     </div>
     <div class="contact">
-        <p>{{ seller.address }}<br>
+        <p>{{ seller.vat }}<br>
+        {{ seller.address }}<br>
         {{ seller.zipcode }} - {% trans seller.city %}<br>
         {% trans seller.get_country_display %}<br>
         </p>
diff --git a/orchestra/contrib/mailer/backends.py b/orchestra/contrib/mailer/backends.py
index a520ee4a..dd66cafd 100644
--- a/orchestra/contrib/mailer/backends.py
+++ b/orchestra/contrib/mailer/backends.py
@@ -1,4 +1,5 @@
 from django.conf import settings as djsettings
+from django.core.mail import get_connection
 from django.core.mail.backends.base import BaseEmailBackend
 
 from orchestra.core.caches import get_request_cache
@@ -27,6 +28,7 @@ class EmailBackend(BaseEmailBackend):
             is_bulk = True
         default_priority = Message.NORMAL if is_bulk else Message.CRITICAL
         num_sent = 0
+        connection = None
         for message in email_messages:
             priority = message.extra_headers.get('X-Mail-Priority', default_priority)
             content = message.message().as_string()
@@ -40,8 +42,12 @@ class EmailBackend(BaseEmailBackend):
                 )
                 if priority == Message.CRITICAL:
                     # send immidiately
-                    send_message.apply_async(message)
+                    if connection is None:
+                        connection = get_connection(backend='django.core.mail.backends.smtp.EmailBackend')
+                    send_message.apply_async(message, connection=connection)
                 else:
                     message.save()
             num_sent += 1
+        if connection is not None:
+            connection.close()
         return num_sent
diff --git a/orchestra/contrib/mailer/engine.py b/orchestra/contrib/mailer/engine.py
index 14f65c49..62e45772 100644
--- a/orchestra/contrib/mailer/engine.py
+++ b/orchestra/contrib/mailer/engine.py
@@ -14,17 +14,22 @@ from .models import Message
 
 
 def send_message(message, connection=None, bulk=settings.MAILER_BULK_MESSAGES):
-    if connection is None:
-        # Reset connection with django
-        connection = get_connection(backend='django.core.mail.backends.smtp.EmailBackend')
-        connection.open()
-    error = None
     message.last_try = timezone.now()
     update_fields = ['last_try']
     if message.state != message.QUEUED:
         message.retries += 1
         update_fields.append('retries')
     message.save(update_fields=update_fields)
+    if connection is None:
+        connection = get_connection(backend='django.core.mail.backends.smtp.EmailBackend')
+    if connection.connection is None:
+        try:
+            connection.open()
+        except Exception as err:
+            message.defer()
+            message.log(error)
+            return
+    error = None
     try:
         connection.connection.sendmail(message.from_address, [message.to_address], smart_str(message.content))
     except (SocketError,
@@ -42,13 +47,13 @@ def send_message(message, connection=None, bulk=settings.MAILER_BULK_MESSAGES):
 def send_pending(bulk=settings.MAILER_BULK_MESSAGES):
     try:
         with LockFile('/dev/shm/mailer.send_pending.lock'):
-            connection = None
+            connection = get_connection(backend='django.core.mail.backends.smtp.EmailBackend')
             cur, total = 0, 0
             for message in Message.objects.filter(state=Message.QUEUED).order_by('priority', 'last_try', 'created_at'):
-                if cur >= bulk and connection is not None:
+                if cur >= bulk:
                     connection.close()
                     cur = 0
-                connection = send_message(message, connection, bulk)
+                send_message(message, connection, bulk)
                 cur += 1
                 total += 1
             now = timezone.now()
@@ -57,14 +62,15 @@ def send_pending(bulk=settings.MAILER_BULK_MESSAGES):
                 delta = timedelta(seconds=seconds)
                 qs = qs | Q(retries=retries, last_try__lte=now-delta)
             for message in Message.objects.filter(state=Message.DEFERRED).filter(qs).order_by('priority', 'last_try'):
-                if cur >= bulk and connection is not None:
+                if cur >= bulk:
                     connection.close()
                     cur = 0
-                connection = send_message(message, connection, bulk)
+                send_message(message, connection, bulk)
                 cur += 1
                 total += 1
-            if connection is not None:
-                connection.close()
         return total
     except OperationLocked:
         pass
+    finally:
+        if connection.connection is not None:
+            connection.close()
diff --git a/orchestra/contrib/mailer/tasks.py b/orchestra/contrib/mailer/tasks.py
index 90fa9076..c05d9fed 100644
--- a/orchestra/contrib/mailer/tasks.py
+++ b/orchestra/contrib/mailer/tasks.py
@@ -9,9 +9,9 @@ from . import engine, settings
 
 
 @task
-def send_message(message):
+def send_message(message, connection=None):
     message.save()
-    engine.send_message(message)
+    engine.send_message(message, connection=connection)
 
 
 @periodic_task(run_every=crontab(hour=7, minute=30))