diff --git a/README.md b/README.md
index 1f9d001d..b138936e 100644
--- a/README.md
+++ b/README.md
@@ -1,16 +1,19 @@
 # docker-mailserver
 
-A fullstack but simple mail  server (smtp, imap, antispam, antivirus...)
+A fullstack but simple mail server (smtp, imap, antispam, antivirus...)
 
 Includes:
 
-- postfix
+- postfix with smtp auth
 - courier-imap
+- amavis
 - spamassasin
 - clamav
-- amavis
 
-Only config files, no *sql database required.
+Additional informations:
+
+- only config files, no *sql database required
+- mails are stored in `/var/mail/${domain}/${username}`
 
 ## installation
 
@@ -32,8 +35,6 @@ Only config files, no *sql database required.
 	  - "143:143"
 	  - "587:587"
 	  - "993:993"
-	  volumes:
-	    - ./configs/postfix:/etc/postfix
 	  environment:
 	    docker_mail_domain: "my-domain.com"
 	    # format is user@domain.tld|clear_password
diff --git a/start-mailserver.sh b/start-mailserver.sh
index edeaeeb8..4a1754b3 100644
--- a/start-mailserver.sh
+++ b/start-mailserver.sh
@@ -25,9 +25,10 @@ done < /tmp/docker_mail_users
 rm /tmp/docker_mail_users
 makeuserdb
 
-echo "Postmap configurations"
+echo "Postfix configurations"
+sed -i -r 's/DOCKER_MAIL_DOMAIN/$docker_mail_domain/g' /etc/postfix/main.cf
 postmap /etc/postfix/vmailbox
-postmap /etc/postfix/virtual
+[ -f /etc/postfix/virtual ] && postmap /etc/postfix/virtual
 
 echo "Fixing permissions"
 chown -R 5000:5000 /var/mail