diff --git a/target/scripts/check-for-changes.sh b/target/scripts/check-for-changes.sh
index e0bfe472..ef49fbbc 100755
--- a/target/scripts/check-for-changes.sh
+++ b/target/scripts/check-for-changes.sh
@@ -4,7 +4,7 @@
 . /usr/local/bin/helper-functions.sh
 
 LOG_DATE=$(date +"%Y-%m-%d %H:%M:%S ")
-echo "${LOG_DATE} Start check-for-changes script."
+_notify 'task' "${LOG_DATE} Start check-for-changes script."
 
 # ? ––––––––––––––––––––––––––––––––––––––––––––– Checks
 
@@ -13,14 +13,14 @@ cd /tmp/docker-mailserver || exit 1
 # check postfix-accounts.cf exist else break
 if [[ ! -f postfix-accounts.cf ]]
 then
-  echo "${LOG_DATE} postfix-accounts.cf is missing! This should not run! Exit!"
+  _notify 'inf' "${LOG_DATE} postfix-accounts.cf is missing! This should not run! Exit!"
   exit 0
 fi
 
 # verify checksum file exists; must be prepared by start-mailserver.sh
 if [[ ! -f ${CHKSUM_FILE} ]]
 then
-  echo "${LOG_DATE} ${CHKSUM_FILE} is missing! Start script failed? Exit!"
+  _notify 'err' "${LOG_DATE} ${CHKSUM_FILE} is missing! Start script failed? Exit!"
   exit 0
 fi
 
@@ -36,7 +36,7 @@ else
 fi
 
 PM_ADDRESS="${POSTMASTER_ADDRESS:=postmaster@${DOMAINNAME}}"
-echo "${LOG_DATE} Using postmaster address ${PM_ADDRESS}"
+_notify 'inf' "${LOG_DATE} Using postmaster address ${PM_ADDRESS}"
 sleep 10
 
 while true
@@ -48,7 +48,7 @@ do
 
   if ! cmp --silent -- "${CHKSUM_FILE}" "${CHKSUM_FILE}.new"
   then
-    echo "${LOG_DATE} Change detected"
+    _notify 'inf' "${LOG_DATE} Change detected"
     CHANGED=$(grep -Fxvf "${CHKSUM_FILE}" "${CHKSUM_FILE}.new" | sed 's/^[^ ]\+  //')
 
     # Bug alert! This overwrites the alias set by start-mailserver.sh
@@ -66,17 +66,18 @@ do
 
       for FILE in ${CHANGED}
       do
-        case ${FILE} in
-          /etc/letsencrypt/acme.json)
-            for certdomain in ${SSL_DOMAIN} ${HOSTNAME} ${DOMAINNAME}
+        case "${FILE}" in
+          "/etc/letsencrypt/acme.json" )
+            for CERTDOMAIN in ${SSL_DOMAIN} ${HOSTNAME} ${DOMAINNAME}
             do
-              if _extract_certs_from_acme "${certdomain}"
-              then
-                break
-              fi
+              _extract_certs_from_acme "${CERTDOMAIN}" && break
             done
             ;;
-          * ) _notify 'warn' 'file not found for certificate in check_for_changes.sh' ;;
+
+          * )
+            _notify 'warn' 'File not found for certificate in check_for_changes.sh'
+            ;;
+
         esac
       done
 
@@ -120,7 +121,7 @@ do
           then
             while read -r LINE
             do
-              if ! echo "${LINE}" | grep -q -e "\s*#"
+              if ! grep -q -e "\s*#" <<< "${LINE}"
               then
                 echo "${LINE}" >>/etc/postfix/sasl_passwd
               fi
@@ -212,11 +213,11 @@ s/$/ regexp:\/etc\/postfix\/regexp/
 
       if [[ -f /tmp/vhost.tmp ]]
       then
-        # shellcheck disable=SC2002
-        cat /tmp/vhost.tmp | sort | uniq >/etc/postfix/vhost && rm /tmp/vhost.tmp
+        sort < /tmp/vhost.tmp | uniq >/etc/postfix/vhost
+        rm /tmp/vhost.tmp
       fi
 
-      if [[ $(find /var/mail -maxdepth 3 -a \( \! -user 5000 -o \! -group 5000 \) | grep -c .) -ne 0 ]]
+      if find /var/mail -maxdepth 3 -a \( \! -user 5000 -o \! -group 5000 \) | read -r
       then
         chown -R 5000:5000 /var/mail
       fi
@@ -233,3 +234,5 @@ s/$/ regexp:\/etc\/postfix\/regexp/
 
   sleep 1
 done
+
+exit 0
diff --git a/target/scripts/helper-functions.sh b/target/scripts/helper-functions.sh
index 7483afd6..399856c3 100755
--- a/target/scripts/helper-functions.sh
+++ b/target/scripts/helper-functions.sh
@@ -110,17 +110,25 @@ export -f _extract_certs_from_acme
 
 function _notify
 {
-  { [[ -z ${1:-} ]] || [[ -z ${2:-} ]] ; } && return
+  { [[ -z ${1:-} ]] || [[ -z ${2:-} ]] ; } && return 0
 
-  case ${1} in
-    tasklog  ) echo "-e${3:-}" "[ \e[0;92mTASKLOG\e[0m ]  ${2}" ;; # light green
-    warn     ) echo "-e${3:-}" "[ \e[0;93mWARNING\e[0m ]  ${2}" ;; # light yellow
-    err      ) echo "-e${3:-}" "[  \e[0;31mERROR\e[0m  ]  ${2}" ;; # light red
-    fatal    ) echo "-e${3:-}" "[  \e[0;91mFATAL\e[0m  ]  ${2}" ;; # red
-    inf      ) [[ ${DMS_DEBUG} -eq 1 ]] && echo "-e${3:-}" "[[  \e[0;34mINF\e[0m  ]]  ${2}" ;; # light blue
-    task     ) [[ ${DMS_DEBUG} -eq 1 ]] && echo "-e${3:-}" "[[ \e[0;37mTASKS\e[0m ]]  ${2}" ;; # light grey
-    *        ) ;;
+  local RESET LGREEN LYELLOW LRED RED LBLUE LGREY LMAGENTA
+
+  RESET='\e[0m' ; LGREEN='\e[92m' ; LYELLOW='\e[93m'
+  LRED='\e[31m' ; RED='\e[91m' ; LBLUE='\e[34m'
+  LGREY='\e[37m' ; LMAGENTA='\e[95m'
+
+  case "${1}" in
+    'tasklog'  ) echo "-e${3:-}" "[ ${LGREEN}TASKLOG${RESET} ]  ${2}"  ;;
+    'warn'     ) echo "-e${3:-}" "[ ${LYELLOW}WARNING${RESET} ]  ${2}" ;;
+    'err'      ) echo "-e${3:-}" "[  ${LRED}ERROR${RESET}  ]  ${2}"    ;;
+    'fatal'    ) echo "-e${3:-}" "[  ${RED}FATAL${RESET}  ]  ${2}"     ;;
+    'inf'      ) [[ ${DMS_DEBUG} -eq 1 ]] && echo "-e${3:-}" "[[  ${LBLUE}INF${RESET}  ]]  ${2}" ;;
+    'task'     ) [[ ${DMS_DEBUG} -eq 1 ]] && echo "-e${3:-}" "[[ ${LGREY}TASKS${RESET} ]]  ${2}" ;;
+    *          ) echo "-e${3:-}" "[  ${LMAGENTA}UNKNOWN${RESET}  ]  ${2}" ;;
   esac
+
+  return 0
 }
 export -f _notify
 
diff --git a/test/mail_ssl_letsencrypt.bats b/test/mail_ssl_letsencrypt.bats
index f5acbdbf..36b3e8df 100644
--- a/test/mail_ssl_letsencrypt.bats
+++ b/test/mail_ssl_letsencrypt.bats
@@ -37,7 +37,7 @@ function setup_file() {
     -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
     -v "${PRIVATE_CONFIG}/acme.json":/etc/letsencrypt/acme.json:ro \
     -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
-    -e DMS_DEBUG=0 \
+    -e DMS_DEBUG=1 \
     -e SSL_TYPE=letsencrypt \
     -e "SSL_DOMAIN=*.example.com" \
     -h mail.my-domain.com -t "${NAME}"