Take a look at www.dyndns.org

They give the dynamic DNS service & advice on some clients that detects
when there is a change of IP, and automatically update dyndns.org !


Len Conrad wrote:
> 
> >Ok, so
> >ETRNdomain.ar    smtp:[hostname]
> >would be the way to go for ETRN dynamic IP ....
> 
> well, yeah, but changing a hostname's ip could done in the OS's hosts
> file (might as well re-write postfix's transport.map file) or in DNS
> with dynamic updates, but that requires your update app to have
> allow-update with the DNS for that zone.
> 
> Len
> 
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