diff --git a/MailServerInstall.md b/MailServerInstall.md
index 8ee1d4b..b586099 100644
--- a/MailServerInstall.md
+++ b/MailServerInstall.md
@@ -247,4 +247,13 @@ quit (Pour sortir de Telnet)
 ### Installation de `Courier`
 ```console 
 root@serveur:~# apt-get install courier-base courier-authdaemon courier-authlib-mysql courier-imap courier-pop
-```
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+```
+
+### Configuration de 'Courier'
+
+Editer `/etc/courier/authdaemonrc`
+```console
+root@serveur:~# vim /etc/courier/authdaemonrc
+```
+
+Modifier la ligne: `authmodulelist = authpam` -> `authmodulelist = authmysql`
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