diff --git a/.woodpecker.yml b/.woodpecker.yml
index 3900fc2..6d77166 100644
--- a/.woodpecker.yml
+++ b/.woodpecker.yml
@@ -22,6 +22,6 @@ matrix:
   - ALPINE_VERSION: "3.19.0"
     POSTFIX_VERSION: "3.8.4"
   - ALPINE_VERSION: "3.18.4"
-    POSTFIX_VERSION: "3.8.3"
+    POSTFIX_VERSION: "3.8.4"
   - ALPINE_VERSION: "3.17.5"
-    POSTFIX_VERSION: "3.7.8"
+    POSTFIX_VERSION: "3.7.9"
diff --git a/Dockerfile b/Dockerfile
index 148b7b4..00a3bcf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -71,6 +71,8 @@ RUN postconf -e virtual_alias_maps=lmdb:/etc/postfix/maps/virtual
 RUN postconf -e sender_canonical_classes=envelope_sender
 RUN postconf -e recipient_canonical_classes=envelope_recipient,header_recipient
 RUN postconf -e smtpd_client_connection_rate_limit=10
+RUN postconf -e smtpd_forbid_bare_newline=yes
+RUN postconf -e smtpd_forbid_bare_newline_exclusions='$mynetworks'
 
 ARG ALPINE_VERSION=3.18.3
 ARG BASE_IMAGE=gitea.nulo.in/sutty/monit