diff --git a/colab/super_archives/management/commands/import_emails.py b/colab/super_archives/management/commands/import_emails.py
index 7c3acd4..3ee3a4b 100644
--- a/colab/super_archives/management/commands/import_emails.py
+++ b/colab/super_archives/management/commands/import_emails.py
@@ -295,3 +295,7 @@ class Command(BaseCommand, object):
             raise
         finally:
             os.remove(self.lock_file)
+
+        for mlist in MailingList.objects.all():
+            mlist.update_privacy()
+            mlist.save()
\ No newline at end of file
diff --git a/colab/super_archives/migrations/0002_mailinglist_is_private.py b/colab/super_archives/migrations/0002_mailinglist_is_private.py
new file mode 100644
index 0000000..1d36896
--- /dev/null
+++ b/colab/super_archives/migrations/0002_mailinglist_is_private.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('super_archives', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='mailinglist',
+            name='is_private',
+            field=models.BooleanField(default=False),
+            preserve_default=True,
+        ),
+    ]
diff --git a/colab/super_archives/search_indexes.py b/colab/super_archives/search_indexes.py
index f0165e9..1e328a9 100644
--- a/colab/super_archives/search_indexes.py
+++ b/colab/super_archives/search_indexes.py
@@ -85,10 +85,12 @@ class ThreadIndex(BaseIndex, indexes.Indexable):
         return u'thread'
 
     def index_queryset(self, using=None):
-        return self.get_model().objects.filter(
-            spam=False
+        elements = self.get_model().objects.filter(
+            spam=False, mailinglist__is_private=False
         ).exclude(subject_token='')
 
+        return elements
+
     def get_boost(self, obj):
         boost = super(ThreadIndex, self).get_boost(obj)
 
--
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