>what is the best way to put this in dns
>
>mx 5 somedomain
>mx 10 somedomain

try to send to the A record for somedomain.

if the query returns multiple A records, use the first one (only).

if that A record unreachable, try mx 10

>or
>
>mx 5 somedomain
>
>
>and in somedomain have this
>
>somedomain in A 0.0.0.0
>somedomain in A 0.0.0.1

try to send to the A record for somedomain.

if the query returns multiple A records, use the first one (only).

if that A record unreachable, terminate delivery.

If you want to distribute inbound traffic, with failover, over more than 
one MX:

mx 5 label1.domain
mx 5 label2.domain

Len











>and when adding more serves in front just put in more A records ?


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