diff --git a/config.inc.php b/config.inc.php
index e6e5539b..3240bb9b 100644
--- a/config.inc.php
+++ b/config.inc.php
@@ -88,6 +88,7 @@ $CONF['smtp_port'] = '25';
 // md5 = md5 sum of the password
 // system = whatever you have set as your PHP system default
 // cleartext = clear text passwords (ouch!)
+// mysql_encrypt = useful for PAM integration
 $CONF['encrypt'] = 'md5crypt';
 
 // Minimum length required for passwords. Postfixadmin will not
diff --git a/functions.inc.php b/functions.inc.php
index 666cabfe..13b34314 100644
--- a/functions.inc.php
+++ b/functions.inc.php
@@ -1146,6 +1146,20 @@ function pacrypt ($pw, $pw_db="")
     if ($CONF['encrypt'] == 'cleartext') {
         $password = $pw;
     }
+
+    // See https://sourceforge.net/tracker/?func=detail&atid=937966&aid=1793352&group_id=191583
+    // this is apparently useful for pam_mysql etc.
+    if ($CONF['encrypt'] == 'mysql_encrypt')
+    {
+        if ($pw_db!="") {
+            $salt=substr($pw_db,0,2);
+            $res=db_query("SELECT ENCRYPT('".$pw."','".$salt."');");
+        } else {
+            $res=db_query("SELECT ENCRYPT('".$pw."');");
+        }
+        $l = db_row($res["result"]);
+        $password = $l[0];
+    }
     $password = escape_string ($password);
     return $password;
 }