email2activity does not handle rtf and doc attachments

i was testing email2activity.php and it does not include attachment that are .rtf and .doc type/extension. they are just simply not included in the database. it does recognise .jpg, .png, .gif

i run email2activity.php from cron as a different user than www-data. i need to run it as virtual-email-user in order to allow it to handle emails properly. i had to include this user in www-data group and make some folders and files group +rw.