diff --git a/submit.php b/submit.php
index 4061e48..2b5fbed 100644
--- a/submit.php
+++ b/submit.php
@@ -435,7 +435,7 @@ exec ($cmd);
 $file = "$resultnam.pdf";
 
 if ($_POST['sendmail']=='yes'){
-	$subj = "Kostenerstattungsantrag ueber".calcSum()." ".$_POST['currency'];	
+	$subj = "Kostenerstattungsantrag ueber ".calcSum()." ".$_POST['currency'];	
 
 
 	$mail = new PHPMailer\PHPMailer\PHPMailer();
@@ -450,6 +450,7 @@ if ($_POST['sendmail']=='yes'){
 	$mail->IsSMTP();	
 	$mail->setFrom($mailFrom);
 	$mail->Subject = $subj;
+	$mail->addCustomHeader('Auto-Submitted', 'auto-generated'); // comply to RFC 3834 (https://www.iana.org/assignments/auto-submitted-keywords/auto-submitted-keywords.xhtml)
 	$mail->Body = "Kostenerstattungsantrag ...";
 	$mail->AddAddress($mailDest);
 	if ($mailDestCC) {