Jeroen, you say that configuring DNS settings you can do a mail server backup?
As I know, you have to point a seconday dns entry to a mailserver backup, and configure this mail server to take the mails, and relay to primary MX server, isn't it?
When primary server goes down, secondary mail server catch all mail and stores until the first mail server goes on...
So the secondary mail server (in my case ispconfig) would be configured to take mail...
Some thanks,
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