--- rsmtp.in.orig	1999-05-16 11:24:09.000000000 +0200
+++ rsmtp.in	2013-11-01 19:55:42.000000000 +0100
@@ -72,7 +72,7 @@ while (<>) {
     print STDERR "Recipient: $r\n" if ($debug);
     push (@recipients, $r);
   }
-  $sendmail="$sendmailproto -f$mailfrom -p@INPROTO@:$fromhost";
+  $sendmail="$sendmailproto -f$mailfrom -p@INPROTO@:$fromhost --";
   while (defined $recipients[0]) {
     $sendmail .= " " . $recipients[0];
     shift (@recipients);