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Backup MX cPanel server with forwarding?

Discussion in 'E-mail Discussion' started by Anypony, Jan 27, 2013.

  1. Anypony

    Anypony Member

    May 15, 2012
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    Root Administrator
    My main domain has been offline (null-routed) due to a DDoS attack for coming up 5 days now, host and hosts ISP both not happy. However this VPS is a mail server and because of this downtime 36k+ emails will bounce back, some will be saved by queuing but considering the amount of downtime, it's a loosing battle.

    I need to know the best way to setup a secondary mx record and server so that when the main server comes back users can find their mail in their inbox. (Not for this time obviously, but I know my domain is a target and I need to be more prepared for next time).

    What I have thought about so far:

    - setup new WHM server on new server (server2)
    - create new user, use account name and domain of server1
    - rsync /etc/localdomains on server1 to /etc/secondarymx on server2
    - point secondary mx record to server2's IP (with lower priority obviously)

    What I don't know/understand is:

    a) Is there anything else I need to do to get the secondary mx server working? (Perhaps rsyncing the /mail directory of the domain on server1 as well? [if so, hopefully just the directory structure, there is many many GB's of emails in there])

    b) How do I get my mail back? When server1 comes back will it automatically forward emails back to the inbox of email accounts? If not, how can I set this up?

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