diff --git a/README.md b/README.md
index 3a6e533..62199d8 100644
--- a/README.md
+++ b/README.md
@@ -61,34 +61,9 @@ If you are using the docker-compose file above, you can use this command to trig
 docker compose exec dmarc-report /usr/bin/dmarcts-report-parser.pl -i -d -r=1
 ```
 
-
 ## Optional extended configuration
 
-Use SSL instead of default TLS. Set both to 0 to turn off encryption. (not recommended)
-
-```yaml
-- "PARSER_IMAP_SSL=1"
-- "PARSER_IMAP_TLS=0"
-```
-
-Ignore ERROR: message_string() issue experienced with Exchange Online.
-
-```yaml
-- "PARSER_IMAP_IGNORE_ERROR=1"
-```
-
-Parser and Viewer support Postgres now too (default is mysql)
-
-```yaml
-- "REPORT_DB_TYPE=pgsql"
-```
-
-Increase the maximum size of the XML file. (default is `50000` bytes)  
-When the size exceeds the maximum, one could experience an error `Uncaught ValueError: DOMDocument::loadXML(): Argument #1 ($source) must not be empty`.
-
-```yaml
-- "PARSER_XML_MAXSIZE=500000"
-```
+For further optional configuration see the docker-compose [`env-file`](examples/env.example).
 
 ## Contributors
 
diff --git a/examples/docker-compose.mysql.yml b/examples/docker-compose.mysql.yml
index 74b5963..e9f3aae 100644
--- a/examples/docker-compose.mysql.yml
+++ b/examples/docker-compose.mysql.yml
@@ -3,6 +3,7 @@ services:
     image: "gutmensch/dmarc-report:latest"
     hostname: dmarc-report
     container_name: dmarc-report
+    restart: always
     depends_on:
       db:
         condition: service_healthy
@@ -22,15 +23,20 @@ services:
       - "PARSER_IMAP_READ_FOLDER=${IMAP_READ_FOLDER:-Inbox}"
       - "PARSER_IMAP_MOVE_FOLDER=${IMAP_MOVE_FOLDER:-processed}"
       - "PARSER_IMAP_MOVE_FOLDER_ERR=${IMAP_MOVE_FOLDER_ERR:-error}"
+      - "PARSER_IMAP_SSL=${PARSER_IMAP_SSL}"
+      - "PARSER_IMAP_TLS=${PARSER_IMAP_TLS}"
+      - "PARSER_IMAP_IGNORE_ERROR=${PARSER_IMAP_IGNORE_ERROR}"
+      - "PARSER_XML_MAXSIZE=${PARSER_XML_MAXSIZE}"
 
   db:
     image: mariadb:10
     command: --skip-innodb-read-only-compressed
+    restart: always
     environment:
       - "MYSQL_ROOT_PASSWORD=${ROOT_DB_PASSWORD}"
-      - "MYSQL_DATABASE=dmarc_report"
-      - "MYSQL_USER=dmarc_report"
-      - "MYSQL_PASSWORD=${DMARC_DB_PASSWORD}"
+      - "MYSQL_DATABASE=${DB_NAME:-dmarc_report}"
+      - "MYSQL_USER=${DB_USER:-dmarc_report}"
+      - "MYSQL_PASSWORD=${DB_PASSWORD}"
     volumes:
       - ./run/db:/var/lib/mysql
     healthcheck:
diff --git a/examples/docker-compose.postgres.yml b/examples/docker-compose.postgres.yml
index 42cead9..b8da03b 100644
--- a/examples/docker-compose.postgres.yml
+++ b/examples/docker-compose.postgres.yml
@@ -3,6 +3,7 @@ services:
     image: "gutmensch/dmarc-report:latest"
     hostname: dmarc-report
     container_name: dmarc-report
+    restart: always
     depends_on:
       db:
         condition: service_healthy
@@ -10,8 +11,8 @@ services:
       - "80:80"
     environment:
       - "REPORT_DB_HOST=${DB_HOST:-db}"
-      - "REPORT_DB_TYPE=${DB_TYPE:-mysql}"
-      - "REPORT_DB_PORT=${DB_PORT:-3306}"
+      - "REPORT_DB_TYPE=${DB_TYPE:-pgsql}"
+      - "REPORT_DB_PORT=${DB_PORT:-5432}"
       - "REPORT_DB_NAME=${DB_NAME:-dmarc_report}"
       - "REPORT_DB_USER=${DB_USER:-dmarc_report}"
       - "REPORT_DB_PASS=${DB_PASSWORD}"
@@ -22,13 +23,18 @@ services:
       - "PARSER_IMAP_READ_FOLDER=${IMAP_READ_FOLDER:-Inbox}"
       - "PARSER_IMAP_MOVE_FOLDER=${IMAP_MOVE_FOLDER:-processed}"
       - "PARSER_IMAP_MOVE_FOLDER_ERR=${IMAP_MOVE_FOLDER_ERR:-error}"
+      - "PARSER_IMAP_SSL=${PARSER_IMAP_SSL}"
+      - "PARSER_IMAP_TLS=${PARSER_IMAP_TLS}"
+      - "PARSER_IMAP_IGNORE_ERROR=${PARSER_IMAP_IGNORE_ERROR}"
+      - "PARSER_XML_MAXSIZE=${PARSER_XML_MAXSIZE}"
 
   db:
     image: postgres:latest
+    restart: always
     environment:
-      - "POSTGRES_DB=dmarc_report"
-      - "POSTGRES_USER=dmarc_report"
-      - "POSTGRES_PASSWORD=${DMARC_DB_PASSWORD}"
+      - "POSTGRES_DB=${DB_NAME:-dmarc_report}"
+      - "POSTGRES_USER=${DB_USER:-dmarc_report}"
+      - "POSTGRES_PASSWORD=${DB_PASSWORD}"
     volumes:
       - ./run/db:/var/lib/postgresql/data
     healthcheck:
diff --git a/examples/env.example b/examples/env.example
index 067afc8..0e51447 100644
--- a/examples/env.example
+++ b/examples/env.example
@@ -1,16 +1,16 @@
-# databse host address
+# database host address, leave empty for default host "db"
 DB_HOST=
 
-# the database type mysql or pgsql
+# the database type mysql or pgsql, leave empty for default (depending on your docker-compose.yml)
 DB_TYPE=
 
-# the datbase port (mysql 3306) (pqsql 5432)
+# the database port (mysql 3306) (pqsql 5432), leave empty for default (depending on your docker-compose.yml)
 DB_PORT=
 
-# the databse name
+# the database name, leave empty for default "dmarc_report"
 DB_NAME=
 
-# the databse name
+# the database name, leave empty for default "dmarc_report"
 DB_USER=
 
 # mysql root password. Irrelevant if you are using postgres
@@ -28,7 +28,7 @@ IMAP_PASSWORD=
 # the server the email address is hosted on
 IMAP_SERVER=
 
-# optional: default is 993 ( or 143)
+# optional: default is 993 (or 143)
 IMAP_PORT=
 
 # optional: default is "Inbox"
@@ -38,4 +38,16 @@ IMAP_READ_FOLDER
 IMAP_MOVE_FOLDER=
 
 # optional: default is "error"
-IMAP_MOVE_FOLDER_ERR=
\ No newline at end of file
+IMAP_MOVE_FOLDER_ERR=
+
+# Enable SSL and/or (START-)TLS. Set both to 0 to disable encryption (not recommended)
+PARSER_IMAP_SSL=0
+PARSER_IMAP_TLS=1
+
+# Ignore ERROR: message_string() issue experienced with Exchange Online. Set to 1 to enable
+PARSER_IMAP_IGNORE_ERROR=0
+
+# Increase the maximum size of the XML file. (default is 50000 bytes)
+# When the size exceeds the maximum, one could experience an error Uncaught ValueError: DOMDocument::loadXML():
+# Argument #1 ($source) must not be empty.
+PARSER_XML_MAXSIZE=50000
\ No newline at end of file