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-rw-r--r--program/steps/mail/show.inc2
1 files changed, 1 insertions, 1 deletions
diff --git a/program/steps/mail/show.inc b/program/steps/mail/show.inc
index 45d64b87b..1aab3302c 100644
--- a/program/steps/mail/show.inc
+++ b/program/steps/mail/show.inc
@@ -43,7 +43,7 @@ if ($_GET['_uid'])
}
// calculate Etag for this request
- $etag = md5($MESSAGE['UID'].$IMAP->get_mailbox_name().session_id().($PRINT_MODE?1:0));
+ $etag = md5($MESSAGE['UID'].$IMAP->get_mailbox_name().session_id().intval($MESSAGE['headers']->mdn_sent).intval($PRINT_MODE));
// allow caching, unless remote images are present
if ((bool)get_input_value('_safe', RCUBE_INPUT_GET))