Add option to overwrite the From address

run.sh

@@ -68,6 +68,13 @@ if [ ! -z "${SMTP_NETWORKS}" ]; then
 fi
 add_config_value "mynetworks" "${nets}"
 
+if [ ! -z "${OVERWRITE_FROM}" ]; then
+  echo -e "/^From:.*$/ REPLACE From: $OVERWRITE_FROM" > /etc/postfix/smtp_header_checks
+  postmap /etc/postfix/smtp_header_checks
+  postconf -e 'smtp_header_checks = regexp:/etc/postfix/smtp_header_checks'
+  echo "Setting configuration option OVERWRITE_FROM with value: ${OVERWRITE_FROM}"
+fi
+
 #Start services
 
 # If host mounting /var/spool/postfix, we need to delete old pid file before