Re: request discussion of two documents on SMTP relaying

> I can see a set-up where MSA.Domain resolves via the local DNS when 
> connected to DOMAIN's LAN Network (ie: When the user is getting 
> connectivity from that ISP) while the Internet Facing DNS Servers supply 
> a separate MSA Server Farm address. Which MSA Server Farm you connect to 
> is dependent on what Connectivity you currently have and the selection 
> is automatic without the user needing to alter the MUA Parms.
I can see it too, but it looks pretty ugly.  Some applications break if 
DNS doesn't produce consistent results for any given query from one 
location to another.  Multi-faced DNS does exist, but is not something 
we should encourage as part of a BCP.
(for instance, what's to stop a host from caching the result of a DNS 
query for long enough for that host to move to somewhere else on the 
net, as long as the TTL is respected?  and remember, the host doesn't 
have to move at all in physical space in order to move from one location 
in the network to another - it can be as simple as the host seeing a 
free 802.11 WLAN and deciding to abandon its (more expensive) connection 
to the ISP via GPRS.)