diff --git a/charts/mok/Chart.yaml b/charts/mok/Chart.yaml
index aa550387bf8bdca60cc599c59359ff7cf3ac4b08..6ac5765c8f0176239b558d2ec35ca0ddface46bc 100644
--- a/charts/mok/Chart.yaml
+++ b/charts/mok/Chart.yaml
@@ -3,7 +3,7 @@ name: mok
 description: |
   Mail on Kubernetes (MoK) is a project to deploy a functional mailserver that runs without a database server on Kubernetes, taking advantage of configmaps and secret.
 type: application
-version: 0.6.2
+version: 0.6.3
 sources:
   - https://de.postfix.org/ftpmirror/index.html
   - https://github.com/dovecot/core
diff --git a/charts/mok/README.md b/charts/mok/README.md
index 33add2679ed9d901df5a6dacf67044a50e3b3887..1d8f20db0712e1428dfa5b7c789424b52f89b288 100644
--- a/charts/mok/README.md
+++ b/charts/mok/README.md
@@ -1,6 +1,6 @@
 # mok
 
-![Version: 0.6.2](https://img.shields.io/badge/Version-0.6.2-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
+![Version: 0.6.3](https://img.shields.io/badge/Version-0.6.3-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
 
 Mail on Kubernetes (MoK) is a project to deploy a functional mailserver that runs without a database server on Kubernetes, taking advantage of configmaps and secret.
 
@@ -56,7 +56,7 @@ Mail on Kubernetes (MoK) is a project to deploy a functional mailserver that run
 | postfix.hostname | string | `nil` | explicitly set postfix hostname |
 | postfix.image.pullPolicy | string | `"IfNotPresent"` |  |
 | postfix.image.repository | string | `"quay.io/shivering-isles/postfix"` | postfix container image |
-| postfix.image.tag | string | `"0.4.0"` | Overrides the image tag whose default is "latest" |
+| postfix.image.tag | string | `"0.4.1"` | Overrides the image tag whose default is "latest" |
 | postfix.imagePullSecrets | list | `[]` |  |
 | postfix.nodeSelector | object | `{}` |  |
 | postfix.podAnnotations | object | `{}` |  |
diff --git a/charts/mok/values.yaml b/charts/mok/values.yaml
index 471ba276854ff2eb78112b6da0205a77faecd8a7..613a2b342d3f163cf10a7a21b22c89ab9ac7948f 100644
--- a/charts/mok/values.yaml
+++ b/charts/mok/values.yaml
@@ -46,7 +46,7 @@ postfix:
     repository: quay.io/shivering-isles/postfix
     pullPolicy: IfNotPresent
     # -- Overrides the image tag whose default is "latest"
-    tag: "0.4.0"
+    tag: "0.4.1"
 
   imagePullSecrets: []
 
diff --git a/images/postfix/.release b/images/postfix/.release
index 9ecf65833e93819c610252d4a015a950b621a0dc..802d813b703ec71847e4898dd388e8dd03e06d6d 100644
--- a/images/postfix/.release
+++ b/images/postfix/.release
@@ -1 +1 @@
-release=0.4.0
+release=0.4.1
diff --git a/images/postfix/config/main.cf b/images/postfix/config/main.cf
index 248c2a8a121a30411f6d2e9ef15297fb4f1e58bc..41664e2188bfb9d30e114c8213d51c867e6b78c8 100644
--- a/images/postfix/config/main.cf
+++ b/images/postfix/config/main.cf
@@ -98,7 +98,7 @@ postscreen_dnsbl_action = enforce
 postscreen_dnsbl_threshold = 3
 postscreen_dnsbl_allowlist_threshold = -1
 postscreen_dnsbl_sites =
-        zen.spamhaus.org*3,
+        zen.spamhaus.org=127.0.1.[2..254]*3,
         ix.dnsbl.manitu.net*3,
         bl.spamcop.net,
         b.barracudacentral.org,