diff --git a/doc/upgrade.rst b/doc/upgrade.rst
index 8fb5c3a50..2d7e822ab 100644
--- a/doc/upgrade.rst
+++ b/doc/upgrade.rst
@@ -172,6 +172,16 @@ After upgrading modoboa, run the following commands from your virtual environmen
 
    > python manage.py rename_app modoboa_postfix_autoreply postfix_autoreply
 
+`SORBS DNS has been deprecated <https://www.mail-archive.com/mailop@mailop.org/msg22064.html>`_.
+
+If you were using them with postfix, you need to update your
+configuration by removing any reference to it. For example::
+
+# Use some DNSBL
+postscreen_dnsbl_sites =
+	zen.spamhaus.org=127.0.0.[2..11]*3
+	bl.spameatingmonkey.net=127.0.0.2*2
+	bl.spamcop.net=127.0.0.2
 
 2.2.3
 =====
diff --git a/modoboa/admin/constants.py b/modoboa/admin/constants.py
index da54ecb7e..aaa2d2bc6 100644
--- a/modoboa/admin/constants.py
+++ b/modoboa/admin/constants.py
@@ -5,11 +5,9 @@ from django.utils.translation import gettext_lazy as _
 DNSBL_PROVIDERS = [
     "b.barracudacentral.org",
     "bl.spamcop.net",
-    "dnsbl.sorbs.net",
     "ips.backscatterer.org",
     "psbl.surriel.com",
     "sbl.spamhaus.org",
-    "spam.dnsbl.sorbs.net",
     "ubl.unsubscore.com",
     "xbl.spamhaus.org",
     "zen.spamhaus.org",