On Sun, Nov 30, 2014 at 06:10:25PM +0100, Matteo Lanzoni wrote: > Hi, I'm trying to set up a secondary mx. > Can I configure postfix to accept mail only when primary is offline?
Instead implement equivalent anti-spam measure on both primary and
secondary systems, with working recipient validation on both to
avoid backscatter.
Some systems will be unable to reach your primary mx even when it
is generally available, they should still be able to reach your
secondary.
--
Viktor.
