feat: add always_bcc feature

.env.example

@@ -43,3 +43,7 @@
 
 # Optional: This will use allow you to set a custom $message_size_limit value. Default is 10240000.
 #MESSAGE_SIZE_LIMIT=
+
+
+# Optional: This will send all message via BCC to this address. Example setting: ALWAYS_BCC=email@company.com
+#ALWAYS_BCC=

README.md

@@ -87,6 +87,9 @@ The following env variable(s) are optional.
 
 * `MESSAGE_SIZE_LIMIT` This will change the default limit of 10240000 bytes (10MB).
 
+* `ALWAYS_BCC` This will send all message via BCC to this address. Example setting:
+     ALWAYS_BCC=email@company.com
+
 * `DOMAIN` Override origin domain. If not set, defaults to base domain of server hostname.
 
 To use this container from anywhere, the 25 port or the one specified by `SMTP_PORT` needs to be exposed to the docker host server:

run.sh

@@ -122,6 +122,12 @@ if [ ! -z "${MESSAGE_SIZE_LIMIT}" ]; then
   echo "Setting configuration option message_size_limit with value: ${MESSAGE_SIZE_LIMIT}"
 fi
 
+# Set always_bcc
+if [ ! -z "${ALWAYS_BCC}" ]; then
+  postconf -e "always_bcc = ${ALWAYS_BCC}"
+  echo "Setting configuration option always_bcc with value: ${ALWAYS_BCC}"
+fi
+
 #Start services
 
 # If host mounting /var/spool/postfix, we need to delete old pid file before