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secondary MX Server

Hello,

postfix 3.4.5

i mean i have a correct running postfix server. ;-)

Now I like to create a secondary postfix for my system.

What are the best to realize, have this two servers in sync?

I have enable postscreen, all I found on Internet, is to have installed
memcache is this correct?

But what can / must I sync?

Thanks for a answer,