diff --git a/examples/docker-compose.mysql.yml b/examples/docker-compose.mysql.yml
index e9f3aae..f28b6f2 100644
--- a/examples/docker-compose.mysql.yml
+++ b/examples/docker-compose.mysql.yml
@@ -40,7 +40,7 @@ services:
     volumes:
       - ./run/db:/var/lib/mysql
     healthcheck:
-      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-uroot", "-pdbrootpassword"]
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-uroot", "-p${ROOT_DB_PASSWORD}"]
       interval: 10s
       timeout: 10s
-      retries: 5
\ No newline at end of file
+      retries: 5
diff --git a/examples/env.example b/examples/env.example
index 0e51447..e014b8f 100644
--- a/examples/env.example
+++ b/examples/env.example
@@ -32,7 +32,7 @@ IMAP_SERVER=
 IMAP_PORT=
 
 # optional: default is "Inbox"
-IMAP_READ_FOLDER
+IMAP_READ_FOLDER=
 
 # optional: default is "processed"
 IMAP_MOVE_FOLDER=
@@ -50,4 +50,4 @@ 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
+PARSER_XML_MAXSIZE=50000