Am 25.05.2016 um 17:28 schrieb Dianne Skoll:
On Wed, 25 May 2016 10:17:19 -0500 (CDT) sha...@shanew.net wrote:So, for those with more experience, what is the preferred way to run a backup MX (or two or three, etc.) without losing or breaking the benefit of spam filtering?For small installations, I find a backup MX is more trouble than it's worth. So I just don't bother. Seriously, if your Exchange server or whatever is down for more than a couple of hours, you have deeper IT infrastructure problems than can be solved with a backup MX host
the only real usage of a backup-mx is a "always 450" instance on the same-machine but a different IP because many zombies first try the backup-mx, most never come back and the one which would work with greylisting have some minutes more so URIBL/DNSBL catches them
postfix with postscreen supports such a setup with a single config line
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