diff --git a/.github/workflows/tags.yml b/.github/workflows/tags.yml
index 0cedb4e..83bce29 100644
--- a/.github/workflows/tags.yml
+++ b/.github/workflows/tags.yml
@@ -222,6 +222,7 @@ jobs:
       - Helm_chart_Tests
       - Build_Alpine
       - Build_Ubuntu
+      - Build_Debian
 
     steps:
       # Checkout
diff --git a/build-scripts/postfix-install.sh b/build-scripts/postfix-install.sh
index 70a17d9..034cb77 100644
--- a/build-scripts/postfix-install.sh
+++ b/build-scripts/postfix-install.sh
@@ -10,7 +10,7 @@ do_alpine() {
     apk add --upgrade cyrus-sasl cyrus-sasl-static cyrus-sasl-digestmd5 cyrus-sasl-crammd5 cyrus-sasl-login cyrus-sasl-ntlm
     apk add postfix
     apk add opendkim
-    apk add --upgrade ca-certificates tzdata supervisor rsyslog musl musl-utils bash opendkim-utils libcurl jsoncpp lmdb logrotate
+    apk add --upgrade ca-certificates tzdata supervisor rsyslog musl musl-utils bash opendkim-utils libcurl jsoncpp lmdb logrotate netcat-openbsd
 }
 
 do_ubuntu() {
@@ -24,7 +24,7 @@ do_ubuntu() {
     apt-get install -y libsasl2-modules
     apt-get install -y postfix
     apt-get install -y opendkim
-    apt-get install -y ca-certificates tzdata supervisor rsyslog bash opendkim-tools curl libcurl4 libjsoncpp25 sasl2-bin postfix-lmdb logrotate cron
+    apt-get install -y ca-certificates tzdata supervisor rsyslog bash opendkim-tools curl libcurl4 libjsoncpp25 sasl2-bin postfix-lmdb logrotate cron net-tools ${RELEASE_SPECIFIC_PACKAGES}
 }
 
 if [ -f /etc/alpine-release ]; then
diff --git a/integration-tests/external-tools-test/docker-compose.yml b/integration-tests/external-tools-test/docker-compose.yml
new file mode 100644
index 0000000..9851c4e
--- /dev/null
+++ b/integration-tests/external-tools-test/docker-compose.yml
@@ -0,0 +1,14 @@
+version: '3.7'
+services:
+  tests:
+    hostname: "postfix"
+    image: "boky/postfix"
+    restart: no
+    volumes:
+      - "./tests:/tests"
+    environment:
+      FORCE_COLOR: "1"
+      ALLOWED_EMPTY_SENDER_DOMAINS: "example.org"
+      POSTFIX_smtpd_end_of_data_restrictions: "check_client_access static:discard"
+    entrypoint: [ "/bin/sh", "-c" ]
+    command: [ "/tests/test.sh" ]
\ No newline at end of file
diff --git a/integration-tests/external-tools-test/tests/test.sh b/integration-tests/external-tools-test/tests/test.sh
new file mode 100755
index 0000000..3703a7f
--- /dev/null
+++ b/integration-tests/external-tools-test/tests/test.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+set -e
+set -x
+
+if ! hash netstat; then
+    echo "netstat not found!" >2
+    exit 1
+fi
+
+if ! hash nc; then
+    echo "netcat not found!" >2
+    exit 1
+fi
\ No newline at end of file