smtp_client variable empty by default

config.inc.php

@@ -128,7 +128,7 @@ $CONF['smtp_port'] = '25';
 // SMTP Client
 // Hostname (FQDN) of the server hosting Postfix Admin
 // Used in the HELO when sending emails from Postfix Admin
-$CONF['smtp_client'] = 'localhost.localdomain';
+$CONF['smtp_client'] = '';
 
 // Encrypt
 // In what way do you want the passwords to be crypted?

functions.inc.php

@@ -1136,7 +1136,10 @@ function smtp_mail ($to, $from, $data, $body = "") {
     $smtpd_server = $CONF['smtp_server'];
     $smtpd_port = $CONF['smtp_port'];
     //$smtp_server = $_SERVER["SERVER_NAME"];
-    $smtp_server = $CONF['smtp_client'];
+    $smtp_server = php_uname('n');
+    if(!empty($CONF['smtp_client'])) {
+        $smtp_server = $CONF['smtp_client'];
+    }
     $errno = "0";
     $errstr = "0";
     $timeout = "30";