diff --git a/install_postfixadmin.sh b/install_postfixadmin.sh
index ea47734..95a0064 100755
--- a/install_postfixadmin.sh
+++ b/install_postfixadmin.sh
@@ -1937,8 +1937,98 @@ cat <<EOF >> $pfa_conf_file 2> $log_file
    'abuse' => 'postmaster@$DOMAIN',
    'postmaster' => 'postmaster@$DOMAIN'
 );
+
+
 EOF
 
+
+perl -i -n -p -e "s#^(\s*\\\$CONF\['language_hook'\]\s*=.*)#//\n//! 'language_hook' will be overridden - see end of configfile\n//\n\1#" \
+   $pfa_conf_file >> $log_file 2>&1 || _failed=true 
+
+perl -i -n -p -e "s#^(\s*\\\$CONF\['password_validation'\]\s*=.*)#//\n//! 'password_validation' will be overridden - see end of configfile\n//\n\1#" \
+   $pfa_conf_file >> $log_file 2>&1 || _failed=true 
+
+cat <<EOF >> $pfa_conf_file 2> $log_file
+// Password validation
+// New/changed passwords will be validated using all regular expressions in the array.
+// If a password doesn't match one of the regular expressions, the corresponding
+// error message from \$PALANG (see languages/*) will be displayed.
+// See http://de3.php.net/manual/en/reference.pcre.pattern.syntax.php for details
+// about the regular expression syntax.
+// If you need custom error messages, you can add them using \$CONF['language_hook'].
+// If a \$PALANG text contains a %s, you can add its value after the \$PALANG key
+// (separated with a space).
+\$CONF['password_validation'] = array(
+    # minimum length 12 characters
+    '/.{12}/'               => 'password_too_short 12',
+	 # must contain at least 3 characters
+    '/([a-zA-Z].*){3}/'     => 'password_no_characters 3',
+    # must contain at least 2 digits
+    '/([0-9].*){2}/'        => 'password_no_digits 2',
+    # must contain at least 1 special character
+    '/([!?~@#$\\%^&*\\(\\);\\':"\\.,<>{}\\[\\]|=\\-\\+_].*){1}/'  => 'x_password_no_special_characters 1',
+    # must NOT contain
+    '/^[^¿¡§]*$/'           => 'x_password_not_allowed',
+);
+
+/*
+    language_hook example function 
+ 
+    Called if \$CONF['language_hook'] == '<name_of_the_function>'
+    Allows to add or override \$PALANG interface texts.
+
+    If you add new texts, please always prefix them with 'x_' (for example 
+    \$PALANG['x_mytext'] = 'foo') to avoid they clash with texts that might be
+    added to languages/*.lang in future versions of PostfixAdmin.
+
+    Please also make sure that all your added texts are included in all
+    sections - that includes all 'case "XY":' sections and the 'default:'
+    section (for users that don't have any of the languages specified
+    in the 'case "XY":' section). 
+    Usually the 'default:' section should contain english text.
+
+    If you modify an existing text/translation, please consider to report it
+    to the bugtracker on http://sf.net/projects/postfixadmin so that all users
+    can benefit from the corrected text/translation.
+    Returns: modified \$PALANG array
+
+\$CONF['language_hook'] = "language_hook";
+
+function language_hook(\$PALANG, \$language) {
+    switch (\$language) {
+        case "de":
+            \$PALANG['x_whatever'] = 'foo';
+            break;
+        case "fr":
+            \$PALANG['x_whatever'] = 'bar';
+            break;
+        default:
+            \$PALANG['x_whatever'] = 'foobar';
+    }
+    return \$PALANG;
+}
+*/
+
+// Hook to override or add translations in \$PALANG
+// Set to the function name you want to use as hook function (see language_hook example function below)
+\$CONF['language_hook'] = "adjust_plang_hook";
+
+function adjust_plang_hook(\$PALANG, \$language) {
+    switch (\$language) {
+        case "de":
+            \$PALANG['x_password_no_special_characters'] = 'Das Passwort muss mindestens %s Sonderzeichen (!~@#$^&*();\\':",.<>[]{}|=-+_) enhalten.';
+            \$PALANG['x_password_not_allowed'] = 'Die Zeichen \'¿¡§\' sind nicht erlaubt.';
+            break;
+        default:
+            \$PALANG['x_password_no_special_characters'] = 'Your password must contain at least %s special character (!~@#$^&*();\\':",.<>[]{}|=-+_).';
+            \$PALANG['x_password_not_allowed'] = 'Characters \'¿¡§\' are not allowed.'
+    }
+    return \$PALANG;
+}
+
+EOF
+
+
 perl -i -n -p -e "s#^(\s*\\\$CONF\['domain_path'\]\s*=.*)#//!\1\n\\\$CONF['domain_path'] = 'YES';#" \
   $pfa_conf_file >> $log_file 2>&1 || _failed=true 
 perl -i -n -p -e "s#^(\s*\\\$CONF\['domain_in_mailbox'\]\s*=.*)#//!\1\n\\\$CONF['domain_in_mailbox'] = 'NO';#" \