Mark Sapiro wrote:
Dragon wrote:
>
>MTAs are designed to deliver mail to the correct host based on the MX
>record for a given domain.
Except in cases where the recipient domain is one of the MTA's 'local
domains'. In that case, the mail is delivered locally without ever
consulting DNS.
---------------- End original message. ---------------------
Which was sort of implied by the rest of my post, I didn't state it explicitly.
But this is true of any network traffic at the TCP/IP and even at the
MAC layer. If it is local, it doesn't go out on the wire even though
you may be sending it to the physical address of a configured
interface. The network stack is smart enough to know that it should
just pass the traffic in memory instead of sending it on an actual
interface, it essentially, and transparently, substitutes "localhost"
for the address because it knows how to get there directly.
Basically, the principle of "shortest path" is used. How exactly this
gets done in an individual MTA is based on how it is designed and
configured. Since I don't know the exact details of any of them, I
will leave any discussion of how they route local traffic to those
who do know.
Dragon
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Venimus, Saltavimus, Bibimus (et naribus canium capti sumus)
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