Kevin, On 02/14/2013 09:41 PM, Kevin Blackwell wrote: > I have 2 mx records. The primary is Exchanges edge server that has it's > own internal spam filtering. The secondary is poxtfix server relaying > mail to the edge server as a backup mx record. Are you saying the > postfix server should be behind the Exchange edge server? >
A rule of thumb is that if you must have a backup MX you should have the same spam defence as on the primary one. If you can't do that, I suggest you drop the backup MX. Alternatively you can hide the exchange behind a postfix, but the you should let postfix do the spam filtering and disable spam filter on the exchange. You must now ask you the question why you need a backup MX. HTH, Mikael
