- Fix content-type name regexp according to RFC4288.4.2

program/include/rcube_message.php

@@ -468,8 +468,8 @@ class rcube_message
                     else if ($part_orig_mimetype == 'message/rfc822') {
                         $this->parse_structure($mail_part, true);
                     }
-                    // is a regular attachment
+                    // is a regular attachment (content-type name regexp according to RFC4288.4.2)
-                    else if (preg_match('!^[a-z0-9-.+_]+/[a-z0-9-.+_]+$!i', $part_mimetype)) {
+                    else if (preg_match('/^[a-z0-9!#$&.+^_-]+\/[a-z0-9!#$&.+^_-]+$/i', $part_mimetype)) {
                         if (!$mail_part->filename)
                             $mail_part->filename = 'Part '.$mail_part->mime_id;
                         $this->attachments[] = $mail_part;