diff --git a/MailServerInstall.md b/MailServerInstall.md
index 6640c87..5e11850 100644
--- a/MailServerInstall.md
+++ b/MailServerInstall.md
@@ -206,4 +206,10 @@ smtpd_recipient_restrictions =
 # client
 smtpd_client_restrictions =
         permit_mynetworks
-~~~~
\ No newline at end of file
+~~~~
+
+### Modification des droits sur les fichiers de configuration
+```console 
+root@serveur:~# chmod 640 /etx/postfix/mysql-virtual_*.cf
+root@serveur:~# chgrp postfix /etx/postfix/mysql-virtual_*.cf
+```
\ No newline at end of file