diff --git a/Dockerfile b/Dockerfile
index 400e35c1..1397332b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -252,7 +252,6 @@ COPY \
   target/bin/* \
   target/scripts/*.sh \
   target/scripts/startup/*.sh \
-  target/scripts/wrapper/*.sh \
   /usr/local/bin/
 
 RUN chmod +x /usr/local/bin/*
diff --git a/target/scripts/startup/setup.d/postfix.sh b/target/scripts/startup/setup.d/postfix.sh
index 0f1c7c58..4d1bbf6f 100644
--- a/target/scripts/startup/setup.d/postfix.sh
+++ b/target/scripts/startup/setup.d/postfix.sh
@@ -142,6 +142,51 @@ function _setup_SRS
   postconf "sender_canonical_classes = ${SRS_SENDER_CLASSES}"
   postconf 'recipient_canonical_maps = tcp:localhost:10002'
   postconf 'recipient_canonical_classes = envelope_recipient,header_recipient'
+
+  function __generate_secret
+  {
+    (
+      umask 0077
+      dd if=/dev/urandom bs=24 count=1 2>/dev/null | base64 -w0 >"${1}"
+    )
+  }
+
+  local POSTSRSD_SECRET_FILE POSTSRSD_STATE_DIR POSTSRSD_STATE_SECRET_FILE
+
+  sed -i "s/localdomain/${SRS_DOMAINNAME}/g" /etc/default/postsrsd
+
+  POSTSRSD_SECRET_FILE='/etc/postsrsd.secret'
+  POSTSRSD_STATE_DIR='/var/mail-state/etc-postsrsd'
+  POSTSRSD_STATE_SECRET_FILE="${POSTSRSD_STATE_DIR}/postsrsd.secret"
+
+  if [[ -n ${SRS_SECRET} ]]
+  then
+    (
+      umask 0077
+      echo "${SRS_SECRET}" | tr ',' '\n' >"${POSTSRSD_SECRET_FILE}"
+    )
+  else
+    if [[ ${ONE_DIR} -eq 1 ]]
+    then
+      if [[ ! -f ${POSTSRSD_STATE_SECRET_FILE} ]]
+      then
+        install -d -m 0775 "${POSTSRSD_STATE_DIR}"
+        __generate_secret "${POSTSRSD_STATE_SECRET_FILE}"
+      fi
+
+      install -m 0400 "${POSTSRSD_STATE_SECRET_FILE}" "${POSTSRSD_SECRET_FILE}"
+    elif [[ ! -f ${POSTSRSD_SECRET_FILE} ]]
+    then
+      __generate_secret "${POSTSRSD_SECRET_FILE}"
+    fi
+  fi
+
+  if [[ -n ${SRS_EXCLUDE_DOMAINS} ]]
+  then
+    sed -i \
+      "s/^#\?(SRS_EXCLUDE_DOMAINS=).*$/\1=${SRS_EXCLUDE_DOMAINS}/g" \
+      /etc/default/postsrsd
+  fi
 }
 
 function _setup_postfix_hostname
diff --git a/target/scripts/startup/variables-stack.sh b/target/scripts/startup/variables-stack.sh
index 66e98a5a..d149a38f 100644
--- a/target/scripts/startup/variables-stack.sh
+++ b/target/scripts/startup/variables-stack.sh
@@ -107,6 +107,13 @@ function __environment_variables_general_setup
   VARS[POSTFIX_MESSAGE_SIZE_LIMIT]="${POSTFIX_MESSAGE_SIZE_LIMIT:=10240000}" # ~10 MB
   VARS[POSTFIX_DAGENT]="${POSTFIX_DAGENT:=}"
 
+  _log 'trace' 'Setting SRS specific environment variables'
+
+  VARS[SRS_DOMAINNAME]="${SRS_DOMAINNAME:=${DOMAINNAME}}"
+  VARS[SRS_EXCLUDE_DOMAINS]="${SRS_EXCLUDE_DOMAINS:=}"
+  VARS[SRS_SECRET]="${SRS_SECRET:=}"
+  VARS[SRS_SENDER_CLASSES]="${SRS_SENDER_CLASSES:=envelope_sender}"
+
   _log 'trace' 'Setting miscellaneous environment variables'
 
   VARS[ACCOUNT_PROVISIONER]="${ACCOUNT_PROVISIONER:=FILE}"
@@ -123,7 +130,6 @@ function __environment_variables_general_setup
   VARS[PFLOGSUMM_SENDER]="${PFLOGSUMM_SENDER:=${REPORT_SENDER}}"
   VARS[PFLOGSUMM_TRIGGER]="${PFLOGSUMM_TRIGGER:=none}"
   VARS[SMTP_ONLY]="${SMTP_ONLY:=0}"
-  VARS[SRS_SENDER_CLASSES]="${SRS_SENDER_CLASSES:=envelope_sender}"
   VARS[SUPERVISOR_LOGLEVEL]="${SUPERVISOR_LOGLEVEL:=warn}"
   VARS[TZ]="${TZ:=}"
   VARS[UPDATE_CHECK_INTERVAL]="${UPDATE_CHECK_INTERVAL:=1d}"
diff --git a/target/scripts/wrapper/postsrsd-wrapper.sh b/target/scripts/wrapper/postsrsd-wrapper.sh
deleted file mode 100755
index 0e249e5f..00000000
--- a/target/scripts/wrapper/postsrsd-wrapper.sh
+++ /dev/null
@@ -1,47 +0,0 @@
-#!/bin/bash
-
-# shellcheck source=../helpers/index.sh
-source /usr/local/bin/helpers/index.sh
-
-function _generate_secret { ( umask 0077 ; dd if=/dev/urandom bs=24 count=1 2>/dev/null | base64 -w0 > "${1}" ; ) ; }
-
-_obtain_hostname_and_domainname
-
-if [[ -n "${SRS_DOMAINNAME}" ]]
-then
-  NEW_DOMAIN_NAME="${SRS_DOMAINNAME}"
-else
-  NEW_DOMAIN_NAME="${DOMAINNAME}"
-fi
-
-sed -i -e "s/localdomain/${NEW_DOMAIN_NAME}/g" /etc/default/postsrsd
-
-POSTSRSD_SECRET_FILE='/etc/postsrsd.secret'
-POSTSRSD_STATE_DIR='/var/mail-state/etc-postsrsd'
-POSTSRSD_STATE_SECRET_FILE="${POSTSRSD_STATE_DIR}/postsrsd.secret"
-
-if [[ -n ${SRS_SECRET} ]]
-then
-  ( umask 0077 ; echo "${SRS_SECRET}" | tr ',' '\n' > "${POSTSRSD_SECRET_FILE}" ; )
-else
-  if [[ ${ONE_DIR} -eq 1 ]]
-  then
-    if [[ ! -f ${POSTSRSD_STATE_SECRET_FILE} ]]
-    then
-      install -d -m 0775 "${POSTSRSD_STATE_DIR}"
-      _generate_secret "${POSTSRSD_STATE_SECRET_FILE}"
-    fi
-
-    install -m 0400 "${POSTSRSD_STATE_SECRET_FILE}" "${POSTSRSD_SECRET_FILE}"
-  elif [[ ! -f ${POSTSRSD_SECRET_FILE} ]]
-  then
-    _generate_secret "${POSTSRSD_SECRET_FILE}"
-  fi
-fi
-
-if [[ -n ${SRS_EXCLUDE_DOMAINS} ]]
-then
-  sed -i -e "s/^#\?SRS_EXCLUDE_DOMAINS=.*$/SRS_EXCLUDE_DOMAINS=${SRS_EXCLUDE_DOMAINS}/g" /etc/default/postsrsd
-fi
-
-/etc/init.d/postsrsd start
diff --git a/target/supervisor/conf.d/supervisor-app.conf b/target/supervisor/conf.d/supervisor-app.conf
index aed64b15..4b4e9a6a 100644
--- a/target/supervisor/conf.d/supervisor-app.conf
+++ b/target/supervisor/conf.d/supervisor-app.conf
@@ -148,7 +148,7 @@ autostart=false
 autorestart=true
 stdout_logfile=/var/log/supervisor/%(program_name)s.log
 stderr_logfile=/var/log/supervisor/%(program_name)s.log
-command=/usr/local/bin/postsrsd-wrapper.sh
+command=/etc/init.d/postsrsd start
 
 [program:update-check]
 startsecs=0