On 22.09.17 18:19, Davide Marchi wrote:
On Debian Jessie, Postfix 2.11.3 and Spamassassin 3.4.0-6, I've just setup an MX email backup server and now I realize that new spam come from the MX backup server.. Is there any way to tell to reject any mail coming to the MX backup server, if the primary server is up?

postscreen, if ou use postfix, supports this:

http://www.postfix.org/POSTSCREEN_README.html#white_veto

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