summaryrefslogtreecommitdiff
path: root/program/steps
diff options
context:
space:
mode:
Diffstat (limited to 'program/steps')
-rw-r--r--program/steps/mail/func.inc1
1 files changed, 1 insertions, 0 deletions
diff --git a/program/steps/mail/func.inc b/program/steps/mail/func.inc
index 25b0338af..bd7fa9c43 100644
--- a/program/steps/mail/func.inc
+++ b/program/steps/mail/func.inc
@@ -1436,6 +1436,7 @@ function rcmail_send_mdn($uid, &$smtp_error)
'Subject' => rcube_label('receiptread') . ': ' . $message->subject,
'Message-ID' => sprintf('<%s@%s>', md5(uniqid('rcmail'.mt_rand(),true)), $RCMAIL->config->mail_domain($_SESSION['imap_host'])),
'X-Sender' => $identity['email'],
+ 'References' => trim($message->headers->references . ' ' . $message->headers->messageID),
);
if ($agent = $RCMAIL->config->get('useragent'))