> MX records are only required if you want to have more than one mail > exchange servers to serve your domain, e.g. if you want to have a > secondary mail server as a relay if the primary server goes down.
actually, i suspect the more common use is that one has a collector
server for a lot of local infrastructure, as in
@ A 666.42.7.11
foo A 666.42.7.12
MX 0 @
bar A 666.42.7.13
MX 0 @
randy
