Hi Sam,
>
> The only other situation where a backup MX is of any value
> is when there's a separate connection between the backup MX
> and the primary MX, and your primary MX's Internet
> connection is unstable. If the connection goes down, but the
> primary MX stays up, mail will flow through the backup MX.
>
> I can't see the value of a backup MX in any other
> situation, so you have to compare these miniscule advantage,
> against the additional exposure to spam via the backup MX,
> and the additional maintenance and costs of a backup MX.
Another posibility to have a MX backup server is Hardware Failure or disasters
recovery, just as happened when Catrina pass over US west coast.
Carlos.
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