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-rw-r--r--plugins/calendar/lib/calendar_itip.php1
1 files changed, 1 insertions, 0 deletions
diff --git a/plugins/calendar/lib/calendar_itip.php b/plugins/calendar/lib/calendar_itip.php
index 6ff5b6b..cb19646 100644
--- a/plugins/calendar/lib/calendar_itip.php
+++ b/plugins/calendar/lib/calendar_itip.php
@@ -143,6 +143,7 @@ class calendar_itip
$message->setParam('head_encoding', 'quoted-printable');
$message->setParam('head_charset', RCMAIL_CHARSET);
$message->setParam('text_charset', RCMAIL_CHARSET . ";\r\n format=flowed");
+ $message->setContentType('multipart/alternative');
// compose common headers array
$headers = array(