diff --git a/Dockerfile b/Dockerfile
index bf92c5a..ae4c04f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.2
+# syntax=docker/dockerfile:1.6
 
 ARG BASE_IMAGE=debian:bookworm-slim
 # ARG BASE_IMAGE=ubuntu:jammy
@@ -61,7 +61,7 @@ VOLUME     [ "/var/spool/postfix", "/etc/postfix", "/etc/opendkim/keys" ]
 USER       root
 WORKDIR    /tmp
 
-HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 CMD printf "EHLO healthcheck\nquit\n" | { while read l ; do sleep 1; echo $l; done } | nc 127.0.0.1 587 -w 2 | grep -qE "^220.*ESMTP Postfix"
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --start-interval=2s --retries=3 CMD printf "EHLO healthcheck\nquit\n" | { while read l ; do sleep 1; echo $l; done } | nc -w 2 127.0.0.1 587 | grep -qE "^220.*ESMTP Postfix"
 
 EXPOSE     587
 CMD        [ "/bin/sh", "-c", "/scripts/run.sh" ]
diff --git a/build.sh b/build.sh
index 280104e..17814fc 100755
--- a/build.sh
+++ b/build.sh
@@ -41,5 +41,6 @@ fi
 #    arg_list="$arg_list --platform linux/amd64,linux/arm64,linux/arm/v7"
 #fi
 
-docker buildx build ${arg_list} $* .
+set -x
+exec docker buildx build ${arg_list} $* .
 
diff --git a/helm/mail/values.yaml b/helm/mail/values.yaml
index 2efa6a9..32b9ba9 100644
--- a/helm/mail/values.yaml
+++ b/helm/mail/values.yaml
@@ -211,7 +211,7 @@ readinessProbe:
       - -c
       - >-
         [ ! -f /tmp/container_is_terminating ] &&
-        printf "EHLO healthcheck\n" | nc 127.0.0.1 587 | grep -qE "^220.*ESMTP Postfix"
+        printf "EHLO healthcheck\nquit\n" | { while read l ; do sleep 1; echo $l; done } | nc -w 2 127.0.0.1 587 | grep -qE "^220.*ESMTP Postfix"
 livenessProbe:
   initialDelaySeconds: 5
   periodSeconds: 5