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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 cc167009f..1fe4aa9b4 100644
--- a/program/steps/mail/show.inc
+++ b/program/steps/mail/show.inc
@@ -53,7 +53,7 @@ if ($_GET['_uid'])
$mbox_name = $IMAP->get_mailbox_name();
// calculate Etag for this request
- $etag = md5($MESSAGE['UID'].$mbox_name.session_id().intval($MESSAGE['headers']->mdn_sent).intval($MESSAGE['is_safe']).intval($PRINT_MODE));
+ $etag = md5($MESSAGE['UID'].$mbox_name.session_id().intval($MESSAGE['headers']->mdn_sent).intval($MESSAGE['headers']->seen).intval($MESSAGE['is_safe']).intval($PRINT_MODE));
// allow caching, unless remote images are present
if ((bool)$MESSAGE['is_safe'])