On 7/8/2017 2:54 PM, techlist06 wrote: > Will > such a client immediately retry on the next available DNS configured MX (if > available)
Yes, many senders will immediately try the secondary MX if the primary gives a temporary error. If you have one MX, most senders will delay some time before a retry. > That > would be great presuming the undesirables don't. > Most clients -- good and bad -- that get a deferral from the primary will try the secondary. Some bad clients will try the secondary first. http://www.postfix.org/POSTSCREEN_README.html#white_veto -- Noel Jones
