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Failover MX-Scenario

IngoPohlschneider
Hello
I am currently thinking about implementing a fallback scenario for our mail-server.

Currently we are using two uplinks with static addresses. One is used for mail (via Multipath rule). The MX record points to an A record which resolves to this static address.

What I now want is the following:
mydomain.de MX 1 mail1.mydomain.de
                      MX 10 mail2.mydomain.de

mail1.mydomain.de A 
mail2.mydomain.de A 

The fallback line is configured for standby, so its down while the other line is up. If I understand MX-records correctly, this config would ALWAYS refer to mail1.mydomain.de unless mail1.mydomain.de is unreachable right?

So that would be a working Failover scenario that would also make sure that my domain doesn't get blacklisted due to wrong sender address right?

Thanks for you guys double-checking


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  • 0
    Hi,

    Just adding the MX record will get email delivered to the backup connection if the primary isn't connected.  You can satisfy most rDNS configurations by having the second ISP add an rDNS PTR record with the hostname of your Cluster.

    Most folks aren't using FCrDNS, so mail sent via the backup connection should be accepted by everyone.  You will want to leave the FQDN in the primary record the same as your hostname though - don't change it or the hostname of the Cluster.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • 0
    Hi,

    Just adding the MX record will get email delivered to the backup connection if the primary isn't connected.  You can satisfy most rDNS configurations by having the second ISP add an rDNS PTR record with the hostname of your Cluster.

    Most folks aren't using FCrDNS, so mail sent via the backup connection should be accepted by everyone.  You will want to leave the FQDN in the primary record the same as your hostname though - don't change it or the hostname of the Cluster.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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