** >The idea behind a second MX record is added redundancy, security and
** >availability. This means "If the mail server hardware or
** software fails,
** >another physical machine takes over."
**
** Your point is valid, but he stated his objective was
** fallback operation for
** "T1 line failure", not for "mail server failure".
Having multiple IPs bound to a NIC is not the way to provide
fault-tolerance in the event of a line failure. For this, only one IP
is needed. Just speak BGP with your transit providers to announce your
address space.
**
** You are right, having taken care of line failure, he should
** look also at
** backup MX.
Yes, a secondary MX off site is a good thing.
-Troy
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