send-email: fix non-threaded mails

diff --git a/git-send-email.perl b/git-send-email.perl
index cccbf4517aa46d4d217a1ce25105f7c413301d2d..5d5169707b452836f3835069e4b015c45d3618af 100755 (executable)
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1137,7 +1137,8 @@ sub send_message
        send_message();
 
        # set up for the next message
-       if ($chain_reply_to || !defined $reply_to || length($reply_to) == 0) {
+       if ($thread &&
+               ($chain_reply_to || !defined $reply_to || length($reply_to) == 0)) {
                $reply_to = $message_id;
                if (length $references > 0) {
                        $references .= "\n $message_id";