diff --git a/core/nginx/conf/nginx.conf b/core/nginx/conf/nginx.conf
index b9bb20b7..11b7468c 100644
--- a/core/nginx/conf/nginx.conf
+++ b/core/nginx/conf/nginx.conf
@@ -17,7 +17,7 @@ http {
     keepalive_timeout 65;
     server_tokens off;
     absolute_redirect off;
-    resolver {{ RESOLVER }} ipv6=off valid=30s;
+    resolver {{ RESOLVER }} valid=30s;
 
     {% if REAL_IP_HEADER %}
     real_ip_header {{ REAL_IP_HEADER }};
@@ -254,7 +254,7 @@ mail {
     server_name {{ HOSTNAMES.split(",")[0] }};
     auth_http http://127.0.0.1:8000/auth/email;
     proxy_pass_error_message on;
-    resolver {{ RESOLVER }} ipv6=off valid=30s;
+    resolver {{ RESOLVER }} valid=30s;
     error_log /dev/stderr info;
 
     {% if TLS and not TLS_ERROR %}
diff --git a/setup/templates/steps/compose/03_expose.html b/setup/templates/steps/compose/03_expose.html
index fe0802fb..6d2150b6 100644
--- a/setup/templates/steps/compose/03_expose.html
+++ b/setup/templates/steps/compose/03_expose.html
@@ -31,7 +31,7 @@ avoid generic all-interfaces addresses like <code>0.0.0.0</code> or <code>::</co
 </div>
 
 <div class="form-group" id="ipv6" style="display: none">
-  <p><span class="label label-danger">Read this:</span> Docker currently does not expose the IPv6 ports properly, as it does not interface with <code>ip6tables</code>. Be sure to read our <a href="https://mailu.io/{{ version }}/faq.html#how-to-make-ipv6-work">FAQ section</a> and be <b>very careful</b> if you still wish to enable this!</p>
+  <p><span class="label label-danger">Read this:</span> Docker currently does not expose the IPv6 ports properly, as it does not interface with <code>ip6tables</code>. Read <a href="https://mailu.io/{{ version }}/faq.html#how-to-make-ipv6-work">FAQ section</a> and be <b>very careful</b>. We do <b>NOT</b> recommend that you enable this!</p>
   <label>IPv6 listen address</label>
 <!--   Validates IPv6 address -->
   <input class="form-control" type="text" name="bind6" value="::1"
diff --git a/towncrier/newsfragments/2260.bugfix b/towncrier/newsfragments/2260.bugfix
new file mode 100644
index 00000000..a98d2212
--- /dev/null
+++ b/towncrier/newsfragments/2260.bugfix
@@ -0,0 +1 @@
+Fix a bug where rspamd may trigger HFILTER_HOSTNAME_UNKNOWN if part of the delivery chain was using ipv6