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-rw-r--r--program/steps/mail/show.inc7
1 files changed, 5 insertions, 2 deletions
diff --git a/program/steps/mail/show.inc b/program/steps/mail/show.inc
index aa5b3733d..b1fa7cfb7 100644
--- a/program/steps/mail/show.inc
+++ b/program/steps/mail/show.inc
@@ -23,8 +23,11 @@ require_once('Mail/mimeDecode.php');
$PRINT_MODE = $_action=='print' ? TRUE : FALSE;
-// allow this request to be cached
-send_future_expire_header();
+// allow caching, unless remote images are present
+if ((bool)get_input_value('_safe', RCUBE_INPUT_GET))
+ send_nocacheing_headers();
+else
+ send_future_expire_header();
// similar code as in program/steps/mail/get.inc
if ($_GET['_uid'])