>For example, if the current TTL is 7 days, then the change to the TTL,
>setting it to ten minutes, should probably be made 8 days before the MX
>change in order to accommodate those that just recently cached the domain
>info.

MX's TTL, or more, before the swtich ...  Your choice, it's your DNS that's 
going to get pounded until the switch.

Len


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