diff --git a/.gitmodules b/.gitmodules
index 0ed2caff..bc127a9e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "test/test_helper/bats-assert"]
 	path = test/test_helper/bats-assert
 	url = https://github.com/ztombol/bats-assert
+[submodule "target/docker-configomat"]
+	path = target/docker-configomat
+	url = https://github.com/alinmear/docker-configomat
diff --git a/Dockerfile b/Dockerfile
index 5eb466e1..677394a1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -144,7 +144,7 @@ RUN curl -s https://letsencrypt.org/certs/lets-encrypt-x3-cross-signed.pem > /et
 
 COPY ./target/bin /usr/local/bin
 # Start-mailserver script
-COPY ./target/start-mailserver.sh /usr/local/bin/
+COPY ./target/start-mailserver.sh ./target/docker-configomat/configomat.sh /usr/local/bin/
 RUN chmod +x /usr/local/bin/*
 
 EXPOSE 25 587 143 993 110 995 4190
diff --git a/Makefile b/Makefile
index ede3f53c..e0695097 100644
--- a/Makefile
+++ b/Makefile
@@ -27,6 +27,7 @@ run:
 		-e SA_TAG=-5.0 \
 		-e SA_TAG2=2.0 \
 		-e SA_KILL=3.0 \
+		-e SA_SPAM_SUBJECT="SPAM: " \
 		-e VIRUSMAILS_DELETE_DELAY=7 \
 		-e SASL_PASSWD="external-domain.com username:password" \
 		-e ENABLE_MANAGESIEVE=1 \
@@ -51,6 +52,13 @@ run:
 		-e OVERRIDE_HOSTNAME=mail.my-domain.com \
 		-t $(NAME)
 	sleep 15
+	docker run -d --name mail_smtponly_without_config \
+		-e SMTP_ONLY=1 \
+		-e ENABLE_LDAP=1 \
+		-e PERMIT_DOCKER=network \
+		-e OVERRIDE_HOSTNAME=mail.mydomain.com \
+		-t $(NAME)
+	sleep 15
 	docker run -d --name mail_override_hostname \
 		-v "`pwd`/test/config":/tmp/docker-mailserver \
 		-v "`pwd`/test":/tmp/docker-mailserver-test \
@@ -99,6 +107,12 @@ run:
 		-e LDAP_SERVER_HOST=ldap \
 		-e LDAP_SEARCH_BASE=ou=people,dc=localhost,dc=localdomain \
 		-e LDAP_BIND_DN=cn=admin,dc=localhost,dc=localdomain \
+		-e LDAP_BIND_PW=admin \
+		-e LDAP_QUERY_FILTER_USER="(&(mail=%s)(mailEnabled=TRUE))" \
+		-e LDAP_QUERY_FILTER_GROUP="(&(mailGroupMember=%s)(mailEnabled=TRUE))" \
+		-e LDAP_QUERY_FILTER_ALIAS="(&(mailAlias=%s)(mailEnabled=TRUE))" \
+		-e DOVECOT_PASS_FILTER="(&(objectClass=PostfixBookMailAccount)(uniqueIdentifier=%n))" \
+		-e DOVECOT_USER_FILTER="(&(objectClass=PostfixBookMailAccount)(uniqueIdentifier=%n))" \
 		-e ENABLE_SASLAUTHD=1 \
 		-e SASLAUTHD_MECHANISMS=ldap \
 		-e SASLAUTHD_LDAP_SERVER=ldap \
@@ -177,6 +191,7 @@ clean:
 		mail \
 		mail_pop3 \
 		mail_smtponly \
+		mail_smtponly_without_config \
 		mail_fail2ban \
 		mail_fetchmail \
 		fail-auth-mailer \
diff --git a/README.md b/README.md
index 22e981ea..18c0f2ed 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ Your configs must be mounted in `/tmp/docker-mailserver/`. To understand how thi
 
 `restart: always` ensures that the mail server container (and ELK container when using the mail server together with ELK stack) is automatically restarted by Docker in cases like a Docker service or host restart or container exit.
 
-```yaml	
+```yaml
 version: '2'
 
 services:
@@ -79,6 +79,60 @@ volumes:
     driver: local
 ```
 
+__for ldap setup__:
+
+```yaml
+version: '2'
+
+services:
+  mail:
+    image: tvial/docker-mailserver:latest
+    hostname: mail
+    domainname: domain.com
+    container_name: mail
+    ports:
+      - "25:25"
+      - "143:143"
+      - "587:587"
+      - "993:993"
+    volumes:
+      - maildata:/var/mail
+      - mailstate:/var/mail-state
+      - ./config/:/tmp/docker-mailserver/
+    environment:
+      - ENABLE_SPAMASSASSIN=1
+      - ENABLE_CLAMAV=1
+      - ENABLE_FAIL2BAN=1
+      - ENABLE_POSTGREY=1
+      - ONE_DIR=1
+      - DMS_DEBUG=0
+      - ENABLE_LDAP=1
+      - LDAP_SERVER_HOST=ldap # your ldap container/IP/ServerName
+      - LDAP_SEARCH_BASE=ou=people,dc=localhost,dc=localdomain
+      - LDAP_BIND_DN=cn=admin,dc=localhost,dc=localdomain
+      - LDAP_BIND_PW=admin
+      - LDAP_QUERY_FILTER_USER="(&(mail=%s)(mailEnabled=TRUE))"
+      - LDAP_QUERY_FILTER_GROUP="(&(mailGroupMember=%s)(mailEnabled=TRUE))"
+      - LDAP_QUERY_FILTER_ALIAS="(&(mailAlias=%s)(mailEnabled=TRUE))"
+      - DOVECOT_PASS_FILTER="(&(objectClass=PostfixBookMailAccount)(uniqueIdentifier=%n))"
+      - DOVECOT_USER_FILTER="(&(objectClass=PostfixBookMailAccount)(uniqueIdentifier=%n))"
+      - ENABLE_SASLAUTHD=1
+      - SASLAUTHD_MECHANISMS=ldap
+      - SASLAUTHD_LDAP_SERVER=ldap
+      - SASLAUTHD_LDAP_BIND_DN=cn=admin,dc=localhost,dc=localdomain
+      - SASLAUTHD_LDAP_PASSWORD=admin
+      - SASLAUTHD_LDAP_SEARCH_BASE=ou=people,dc=localhost,dc=localdomain
+      - POSTMASTER_ADDRESS=postmaster@localhost.localdomain
+    cap_add:
+      - NET_ADMIN
+
+volumes:
+  maildata:
+    driver: local
+  mailstate:
+    driver: local
+```
+
 #### Create your mail accounts
 
 Don't forget to adapt MAIL_USER and MAIL_PASS to your needs
@@ -146,6 +200,12 @@ Note: this spamassassin setting needs `ENABLE_SPAMASSASSIN=1`
 
 Note: this spamassassin setting needs `ENABLE_SPAMASSASSIN=1`
 
+##### SA_SPAM_SUBJECT
+
+  - **\*\*\*SPAM\*\*\*** => add tag to subject if spam detected
+
+Note: this spamassassin setting needs `ENABLE_SPAMASSASSIN=1`
+
 ##### ONE_DIR
 
   - **0** => state in default directories
@@ -206,6 +266,29 @@ Otherwise, `iptables` won't be able to ban IPs.
   - **empty** => admin
   - => Specify the password to bind against ldap
 
+##### LDAP_QUERY_FILTER_USER
+
+  - e.g. `"(&(mail=%s)(mailEnabled=TRUE))"`
+  - => Specify how ldap should be asked for users
+
+##### LDAP_QUERY_FILTER_GROUP
+
+  - e.g. `"(&(mailGroupMember=%s)(mailEnabled=TRUE))"`
+  - => Specify how ldap should be asked for groups
+
+##### LDAP_QUERY_FILTER_ALIAS
+
+  - e.g. `"(&(mailAlias=%s)(mailEnabled=TRUE))"`
+  - => Specify how ldap should be asked for aliases
+
+##### DOVECOT_USER_FILTER
+
+  - e.g. `"(&(objectClass=PostfixBookMailAccount)(uniqueIdentifier=%n))"`
+
+##### DOVECOT_PASS_FILTER
+
+  - e.g. `"(&(objectClass=PostfixBookMailAccount)(uniqueIdentifier=%n))"`
+
 ##### OVERRIDE_HOSTNAME
 
   - **empty** => uses the `hostname` command to get the mail server's canonical hostname
@@ -228,13 +311,13 @@ Otherwise, `iptables` won't be able to ban IPs.
 Note: This postgrey setting needs `ENABLE_POSTGREY=1`
 
 ##### POSTGREY_MAX_AGE
-  
+
   - **35** => delete entries older than N days since the last time that they have been seen
 
 Note: This postgrey setting needs `ENABLE_POSTGREY=1`
 
 ##### POSTGREY_TEXT
-  
+
   - **Delayed by postgrey** => response when a mail is greylisted
 
 Note: This postgrey setting needs `ENABLE_POSTGREY=1`
@@ -247,10 +330,10 @@ Note: This postgrey setting needs `ENABLE_POSTGREY=1`
 ##### SASLAUTHD_MECHANISMS
 
   - empty => pam
-  - ldap => authenticate against ldap server
-  - shadow => authenticate against local user db
-  - mysql => authenticate against mysql db
-  - rimap => authenticate against imap server
+  - `ldap` => authenticate against ldap server
+  - `shadow` => authenticate against local user db
+  - `mysql` => authenticate against mysql db
+  - `rimap` => authenticate against imap server
   - NOTE: can be a list of mechanisms like pam ldap shadow
 
 ##### SASLAUTHD_MECH_OPTIONS
@@ -264,8 +347,8 @@ Note: This postgrey setting needs `ENABLE_POSTGREY=1`
 
 ##### SASLAUTHD_LDAP_SSL
 
-  - empty or 0 => ldap:// will be used
-  - 1 => ldaps:// will be used
+  - empty or 0 => `ldap://` will be used
+  - 1 => `ldaps://` will be used
 
 ##### SASLAUTHD_LDAP_BIND_DN
 
@@ -285,9 +368,9 @@ Note: This postgrey setting needs `ENABLE_POSTGREY=1`
 
 ##### SASLAUTHD_LDAP_FILTER
 
-  - empty => default filter (&(uniqueIdentifier=%u)(mailEnabled=TRUE))
-  - e.g. for active directory: (&(sAMAccountName=%U)(objectClass=person))
-  - e.g. for openldap: (&(uid=%U)(objectClass=person))
+  - empty => default filter `(&(uniqueIdentifier=%u)(mailEnabled=TRUE))`
+  - e.g. for active directory: `(&(sAMAccountName=%U)(objectClass=person))`
+  - e.g. for openldap: `(&(uid=%U)(objectClass=person))`
 
 ##### SASL_PASSWD
 
@@ -325,15 +408,16 @@ Set how many days a virusmail will stay on the server before being deleted
 ##### ENABLE_POSTFIX_VIRTUAL_TRANSPORT
 
 This Option is activating the Usage of POSTFIX_DAGENT to specify a ltmp client different from default dovecot socket.
-    - **empty** => disabled
-    - 1 => enabled
+
+- **empty** => disabled
+- 1 => enabled
 
 ##### POSTFIX_DAGENT
 
 Enabled by ENABLE_POSTFIX_VIRTUAL_TRANSPORT. Specify the final delivery of postfix
-    - **empty**: fail
-    - lmtp:unix:private/dovecot-lmtp (use socket)
-    - lmtps:inet:<host>:<port> (secure lmtp with starttls, take a look at https://sys4.de/en/blog/2014/11/17/sicheres-lmtp-mit-starttls-in-dovecot/)
-    - lmtp:<kopano-host>:2003 (use kopano as mailstore)
-    - etc.
 
+- **empty**: fail
+- `lmtp:unix:private/dovecot-lmtp` (use socket)
+- `lmtps:inet:<host>:<port>` (secure lmtp with starttls, take a look at https://sys4.de/en/blog/2014/11/17/sicheres-lmtp-mit-starttls-in-dovecot/)
+- `lmtp:<kopano-host>:2003` (use kopano as mailstore)
+- etc.
diff --git a/config/postfix-master.cf b/config/postfix-master.cf
new file mode 100644
index 00000000..e69de29b
diff --git a/target/docker-configomat b/target/docker-configomat
new file mode 160000
index 00000000..e3e84ded
--- /dev/null
+++ b/target/docker-configomat
@@ -0,0 +1 @@
+Subproject commit e3e84ded29d88b2945c0782dbb43237c561a54a9
diff --git a/target/start-mailserver.sh b/target/start-mailserver.sh
index f9e688db..86faf0ca 100644
--- a/target/start-mailserver.sh
+++ b/target/start-mailserver.sh
@@ -316,50 +316,6 @@ function display_startup_daemon() {
 	return $res
 }
 
-function override_config() {
-    notify "task" "Starting do do overrides"
-
-    declare -A config_overrides
-
-    _env_variable_prefix=$1
-    [ -z ${_env_variable_prefix} ] && return 1
-
-    
-    IFS=" " read -r -a _config_files <<< $2
-
-    # dispatch env variables
-    for env_variable in $(printenv | grep $_env_variable_prefix);do
-	# get key
-	# IFS not working because values like ldap_query_filter or search base consists of several '='
-	# IFS="=" read -r -a __values <<< $env_variable
-	# key="${__values[0]}"
-	# value="${__values[1]}"
-	key=$(echo $env_variable | cut -d "=" -f1)
-	key=${key#"${_env_variable_prefix}"}
-	# make key lowercase
-	key=${key,,}
-	# get value
-	value=$(echo $env_variable | cut -d "=" -f2-)
-
-	config_overrides[$key]=$value
-    done
-
-    for f in "${_config_files[@]}"
-    do
-	if [ ! -f "${f}" ];then
-	    echo "Can not find ${f}. Skipping override" 
-	else
-	    for key in ${!config_overrides[@]} 
-	    do
-		[ -z $key ] && echo -e "\t no key provided" && return 1
-		
-		sed -i -e "s|^${key}[[:space:]]\+.*|${key} = "${config_overrides[$key]}'|g' \
-		    ${f}
-	    done
-	fi
-    done
-}
-
 # !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 # !  CARE --> DON'T CHANGE, except you know exactly what you are doing
 # !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
@@ -570,21 +526,37 @@ function _setup_ldap() {
 	for i in 'users' 'groups' 'aliases'; do
 	    fpath="/tmp/docker-mailserver/ldap-${i}.cf"
 	    if [ -f $fpath ]; then
-		cp ${fpath} /etc/postfix/ldap-${i}.cf 
+		cp ${fpath} /etc/postfix/ldap-${i}.cf
 	    fi
 	done
 
 	notify 'inf' 'Starting to override configs'
-	override_config "LDAP_" "/etc/postfix/ldap-users.cf /etc/postfix/ldap-groups.cf /etc/postfix/ldap-aliases.cf"
+	for f in /etc/postfix/ldap-users.cf /etc/postfix/ldap-groups.cf /etc/postfix/ldap-aliases.cf
+	do
+		[[ $f =~ ldap-user ]] && export LDAP_QUERY_FILTER="${LDAP_QUERY_FILTER_USER}"
+		[[ $f =~ ldap-group ]] && export LDAP_QUERY_FILTER="${LDAP_QUERY_FILTER_GROUP}"
+		[[ $f =~ ldap-aliases ]] && export LDAP_QUERY_FILTER="${LDAP_QUERY_FILTER_ALIAS}"
+		configomat.sh "LDAP_" "${f}"
+	done
+
+	notify 'inf' "Configuring dovecot LDAP"
+
+	declare -A _dovecot_ldap_mapping
+
+	_dovecot_ldap_mapping["DOVECOT_BASE"]="${DOVECOT_BASE:="${LDAP_SEARCH_BASE}"}"
+	_dovecot_ldap_mapping["DOVECOT_DN"]="${DOVECOT_DN:="${LDAP_BIND_DN}"}"
+	_dovecot_ldap_mapping["DOVECOT_DNPASS"]="${DOVECOT_DNPASS:="${LDAP_BIND_PW}"}"
+	_dovecot_ldap_mapping["DOVECOT_HOSTS"]="${DOVECOT_HOSTS:="${LDAP_SERVER_HOST}"}"
+	# Not sure whether this can be the same or not
+	# _dovecot_ldap_mapping["DOVECOT_PASS_FILTER"]="${DOVECOT_PASS_FILTER:="${LDAP_QUERY_FILTER_USER}"}"
+	# _dovecot_ldap_mapping["DOVECOT_USER_FILTER"]="${DOVECOT_USER_FILTER:="${LDAP_QUERY_FILTER_USER}"}"
+
+	for var in ${!_dovecot_ldap_mapping[@]}; do
+		export $var=${_dovecot_ldap_mapping[$var]}
+	done
+
+	configomat.sh "DOVECOT_" "/etc/dovecot/dovecot-ldap.conf.ext"
 
-	# @TODO: Environment Variables for DOVECOT ldap integration to configure for better control
-	notify 'inf' "Configuring dovecot LDAP authentification"
-	sed -i -e 's|^hosts.*|hosts = '${LDAP_SERVER_HOST:="mail.domain.com"}'|g' \
-		-e 's|^base.*|base = '${LDAP_SEARCH_BASE:="ou=people,dc=domain,dc=com"}'|g' \
-		-e 's|^dn\s*=.*|dn = '${LDAP_BIND_DN:="cn=admin,dc=domain,dc=com"}'|g' \
-		-e 's|^dnpass\s*=.*|dnpass = '${LDAP_BIND_PW:="admin"}'|g' \
-		/etc/dovecot/dovecot-ldap.conf.ext
-					  
 	# Add  domainname to vhost.
 	echo $DOMAINNAME >> /tmp/vhost.tmp
 
@@ -630,7 +602,7 @@ EOF
     # cyrus sasl or dovecot sasl
     if [[ ${ENABLE_SASLAUTHD} == 1 ]] || [[ ${SMTP_ONLY} == 0 ]];then
 	sed -i -e 's|^smtpd_sasl_auth_enable[[:space:]]\+.*|smtpd_sasl_auth_enable = yes|g' /etc/postfix/main.cf
-    else 
+    else
 	sed -i -e 's|^smtpd_sasl_auth_enable[[:space:]]\+.*|smtpd_sasl_auth_enable = no|g' /etc/postfix/main.cf
     fi
 
@@ -668,7 +640,7 @@ EOF
 		 sed -i \
 		 -e "/^[^#].*smtpd_sasl_type.*/s/^/#/g" \
 		 -e "/^[^#].*smtpd_sasl_path.*/s/^/#/g" \
-		 etc/postfix/master.cf
+		 /etc/postfix/master.cf
 
 	sed -i \
 		-e "s|^START=.*|START=yes|g" \
@@ -735,6 +707,9 @@ function _setup_dkim() {
 		chmod -R 0700 /etc/opendkim/keys/
 	else
 		notify 'warn' "No DKIM key provided. Check the documentation to find how to get your keys."
+
+                local _f_keytable="/etc/opendkim/KeyTable"
+                [ ! -f "$_f_keytable" ] && touch "$_f_keytable"
 	fi
 }
 
@@ -902,6 +877,16 @@ function _setup_postfix_override_configuration() {
 	else
 		notify 'inf' "No extra postfix settings loaded because optional '/tmp/docker-mailserver/postfix-main.cf' not provided."
 	fi
+	if [ -f /tmp/docker-mailserver/postfix-master.cf ]; then
+		while read line; do
+		if [[ "$line" =~ ^[a-z] ]]; then
+			postconf -P "$line"
+		fi
+		done < /tmp/docker-mailserver/postfix-master.cf
+		notify 'inf' "Loaded 'config/postfix-master.cf'"
+	else
+		notify 'inf' "No extra postfix settings loaded because optional '/tmp/docker-mailserver/postfix-master.cf' not provided."
+	fi
 }
 
 function _setup_postfix_sasl_password() {
@@ -958,6 +943,7 @@ function _setup_security_stack() {
 		SA_TAG=${SA_TAG:="2.0"} && sed -i -r 's/^\$sa_tag_level_deflt (.*);/\$sa_tag_level_deflt = '$SA_TAG';/g' /etc/amavis/conf.d/20-debian_defaults
 		SA_TAG2=${SA_TAG2:="6.31"} && sed -i -r 's/^\$sa_tag2_level_deflt (.*);/\$sa_tag2_level_deflt = '$SA_TAG2';/g' /etc/amavis/conf.d/20-debian_defaults
 		SA_KILL=${SA_KILL:="6.31"} && sed -i -r 's/^\$sa_kill_level_deflt (.*);/\$sa_kill_level_deflt = '$SA_KILL';/g' /etc/amavis/conf.d/20-debian_defaults
+		SA_SPAM_SUBJECT=${SA_SPAM_SUBJECT:="***SPAM*** "} && sed -i -r 's/^\$sa_spam_subject_tag (.*);/\$sa_spam_subject_tag = '"'$SA_SPAM_SUBJECT'"';/g' /etc/amavis/conf.d/20-debian_defaults
 		test -e /tmp/docker-mailserver/spamassassin-rules.cf && cp /tmp/docker-mailserver/spamassassin-rules.cf /etc/spamassassin/
 	fi
 
diff --git a/test/config/postfix-master.cf b/test/config/postfix-master.cf
new file mode 100644
index 00000000..a6c1d80d
--- /dev/null
+++ b/test/config/postfix-master.cf
@@ -0,0 +1 @@
+submission/inet/smtpd_sasl_security_options=noanonymous
diff --git a/test/tests.bats b/test/tests.bats
index bf151aee..efde018a 100644
--- a/test/tests.bats
+++ b/test/tests.bats
@@ -341,7 +341,7 @@ load 'test_helper/bats-assert/load'
   run docker exec mail_smtponly /bin/sh -c 'grep -cE "to=<user2\@external.tld>.*status\=sent" /var/log/mail/mail.log'
   [ "$status" -ge 0 ]
 }
-  
+
 
 
 #
@@ -391,6 +391,11 @@ load 'test_helper/bats-assert/load'
   assert_success
 }
 
+@test "checking postfix: master.cf overrides" {
+  run docker exec mail grep -q 'submission/inet/smtpd_sasl_security_options=noanonymous' /tmp/docker-mailserver/postfix-master.cf
+  assert_success
+}
+
 #
 # dovecot
 #
@@ -424,6 +429,8 @@ load 'test_helper/bats-assert/load'
   assert_success
   run docker exec mail_pop3 /bin/sh -c "grep '\$sa_kill_level_deflt' /etc/amavis/conf.d/20-debian_defaults | grep '= 6.31'"
   assert_success
+  run docker exec mail_pop3 /bin/sh -c "grep '\$sa_spam_subject_tag' /etc/amavis/conf.d/20-debian_defaults | grep '= .\*\*\*SPAM\*\*\* .'"
+  assert_success
 }
 
 @test "checking spamassassin: docker env variables are set correctly (custom)" {
@@ -433,6 +440,8 @@ load 'test_helper/bats-assert/load'
   assert_success
   run docker exec mail /bin/sh -c "grep '\$sa_kill_level_deflt' /etc/amavis/conf.d/20-debian_defaults | grep '= 3.0'"
   assert_success
+  run docker exec mail /bin/sh -c "grep '\$sa_spam_subject_tag' /etc/amavis/conf.d/20-debian_defaults | grep '= .SPAM: .'"
+  assert_success
 }
 
 @test "checking spamassassin: all registered domains should see spam headers" {
@@ -472,6 +481,12 @@ load 'test_helper/bats-assert/load'
   assert_output 2
 }
 
+@test "checking opendkim: /etc/opendkim/KeyTable dummy file generated without keys provided" {
+  run docker exec mail_smtponly_without_config /bin/bash -c "cat /etc/opendkim/KeyTable"
+  assert_success
+}
+
+
 @test "checking opendkim: /etc/opendkim/keys/ should contain 2 entries" {
   run docker exec mail /bin/sh -c "ls -l /etc/opendkim/keys/ | grep '^d' | wc -l"
   assert_success
@@ -1036,34 +1051,34 @@ load 'test_helper/bats-assert/load'
 }
 
 @test "checking postfix: ldap custom config files copied" {
- run docker exec mail_with_ldap /bin/sh -c "grep '# Testconfig for ldap integration' /etc/postfix/ldap-users.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep '# Testconfig for ldap integration' /etc/postfix/ldap-users.cf"
  assert_success
- run docker exec mail_with_ldap /bin/sh -c "grep '# Testconfig for ldap integration' /etc/postfix/ldap-groups.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep '# Testconfig for ldap integration' /etc/postfix/ldap-groups.cf"
  assert_success
- run docker exec mail_with_ldap /bin/sh -c "grep '# Testconfig for ldap integration' /etc/postfix/ldap-aliases.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep '# Testconfig for ldap integration' /etc/postfix/ldap-aliases.cf"
  assert_success
 }
 
 @test "checking postfix: ldap config overwrites success" {
- run docker exec mail_with_ldap /bin/sh -c "grep 'server_host = ldap' /etc/postfix/ldap-users.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'server_host = ldap' /etc/postfix/ldap-users.cf"
  assert_success
- run docker exec mail_with_ldap /bin/sh -c "grep 'search_base = ou=people,dc=localhost,dc=localdomain' /etc/postfix/ldap-users.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'search_base = ou=people,dc=localhost,dc=localdomain' /etc/postfix/ldap-users.cf"
  assert_success
- run docker exec mail_with_ldap /bin/sh -c "grep 'bind_dn = cn=admin,dc=localhost,dc=localdomain' /etc/postfix/ldap-users.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'bind_dn = cn=admin,dc=localhost,dc=localdomain' /etc/postfix/ldap-users.cf"
  assert_success
 
- run docker exec mail_with_ldap /bin/sh -c "grep 'server_host = ldap' /etc/postfix/ldap-groups.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'server_host = ldap' /etc/postfix/ldap-groups.cf"
  assert_success
- run docker exec mail_with_ldap /bin/sh -c "grep 'search_base = ou=people,dc=localhost,dc=localdomain' /etc/postfix/ldap-groups.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'search_base = ou=people,dc=localhost,dc=localdomain' /etc/postfix/ldap-groups.cf"
  assert_success
- run docker exec mail_with_ldap /bin/sh -c "grep 'bind_dn = cn=admin,dc=localhost,dc=localdomain' /etc/postfix/ldap-groups.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'bind_dn = cn=admin,dc=localhost,dc=localdomain' /etc/postfix/ldap-groups.cf"
  assert_success
 
- run docker exec mail_with_ldap /bin/sh -c "grep 'server_host = ldap' /etc/postfix/ldap-aliases.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'server_host = ldap' /etc/postfix/ldap-aliases.cf"
  assert_success
- run docker exec mail_with_ldap /bin/sh -c "grep 'search_base = ou=people,dc=localhost,dc=localdomain' /etc/postfix/ldap-aliases.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'search_base = ou=people,dc=localhost,dc=localdomain' /etc/postfix/ldap-aliases.cf"
  assert_success
- run docker exec mail_with_ldap /bin/sh -c "grep 'bind_dn = cn=admin,dc=localhost,dc=localdomain' /etc/postfix/ldap-aliases.cf" 
+ run docker exec mail_with_ldap /bin/sh -c "grep 'bind_dn = cn=admin,dc=localhost,dc=localdomain' /etc/postfix/ldap-aliases.cf"
  assert_success
 }
 
@@ -1074,7 +1089,7 @@ load 'test_helper/bats-assert/load'
 }
 
 # This is ldap, so the mail directory gets set differently!
-@test "checking dovecot: mail delivery works" {
+@test "checking dovecot: ldap mail delivery works" {
   run docker exec mail_with_ldap /bin/sh -c "sendmail -f user@external.tld some.user@localhost.localdomain < /tmp/docker-mailserver-test/email-templates/test-email.txt"
   sleep 10
   run docker exec mail_with_ldap /bin/sh -c "ls -A /var/mail/localhost.localdomain/some.user/new | wc -l"
@@ -1082,6 +1097,15 @@ load 'test_helper/bats-assert/load'
   assert_output 1
 }
 
+@test "checking dovecot: ldap config overwrites success" {
+  run docker exec mail_with_ldap /bin/sh -c "grep 'hosts = ldap' /etc/dovecot/dovecot-ldap.conf.ext"
+  assert_success
+  run docker exec mail_with_ldap /bin/sh -c "grep 'base = ou=people,dc=localhost,dc=localdomain' /etc/dovecot/dovecot-ldap.conf.ext"
+  assert_success
+  run docker exec mail_with_ldap /bin/sh -c "grep 'dn = cn=admin,dc=localhost,dc=localdomain' /etc/dovecot/dovecot-ldap.conf.ext"
+  assert_success
+}
+
 # saslauthd
 @test "checking saslauthd: sasl ldap authentication works" {
   run docker exec mail_with_ldap bash -c "testsaslauthd -u some.user -p secret"