mehargags wrote:This indeed is "clustering" so that the servers sync up the data (mails) with each other. If one server goes down the other is taking in the "calls" for incoming and outgoing. This is not supported in VestaCP yet (to my best guess) but you can setup secondary MX using some guides on internet
If testing succeeded and you receive the e-mail you can now set-up the second MX record with a higher priority (i.e. 20). When MX1 is offline, MX2 will receive the e-mails. When MX1 is back online, MX2 will send the emails to MX1.
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