- allow '+' character in mimetype name (#1486239)

1 files changed, 1 insertions, 1 deletions

diff --git a/program/include/rcube_message.php b/program/include/rcube_message.php
index 7c2457e55..1a22427d0 100644
--- a/program/include/rcube_message.php
+++ b/program/include/rcube_message.php
@@ -402,7 +402,7 @@ class rcube_message
             $this->inline_parts[] = $mail_part;
           }
           // is a regular attachment
-          else if (preg_match('!^[a-z]+/[a-z0-9-.]+$!i', $mail_part->mimetype)) {
+          else if (preg_match('!^[a-z]+/[a-z0-9-.+]+$!i', $mail_part->mimetype)) {
             if (!$mail_part->filename)
               $mail_part->filename = 'Part '.$mail_part->mime_id;
             $this->attachments[] = $mail_part;