We have installed a new spam filter on our Plesk windows servers. Basically, this is a system we have designed for our linux servers but it can work on windows too. (We found SA and AV on Plesk was overloading our servers so devised a new system and there is no user-level SA on Windows anyway....) On linux, we process all mail on separate servers - mail comes into the server, gets sent to mail servers, gets processed with spamassassin and anti-virus and thhen gets sent back to the server. This means that the web servers aren't affected by load caused by these processes and it works nicely. So going to do the same on windows. At domain level we put a custom button called Spam Filter Configuration and also in the Mail Area, we've hacked in a link with the Plesk Spam Filter image and they link to the SpamAssassin interface hosted on another server that sets rules on our mail gateway config. So we need to send all mail that comes into the Windows servers to our mail gateway servers by adding MX records: ms1.mailserver.com ms2.mailserver.com ms3.mailserver.com ...etc, etc. On Linux it's very easy to regenerate all the dns zone in the database but we have to find out how to do this on Windows. We just need to rebuild all current domain's dns zones with the above MX records and remove the default MX record (mail.domain.com). Any ideas?