When I try to send a message to the wp-testers list hosted on lists.automattic.com, my message bounces because our mail server is picky about MX records. Apparently, there is no MX record set up for lists.automattic.com. (http://www.dnsstuff.com/tools/lookup.ch?name=lists.automattic.com&type=MX)
Is there a reason that there is no valid MX record? Any chance that there might be one in the future?