[ih] Some Questions over IPv4 Ownership

[Jorge Amodio]

> It's all store-and-forward, and the forwarding step uses whatever
> external information the forwarder can glean.  A difference is the
> routing mechanism.  (Typical) Internet routing gathers information in
> advance because it has to forward its packets fast (and suffers when
> reality doesn't match the information it has gathered), while mailers
> have a nice mapping system built for them called DNS that they use on
> demand.

I always thought email routing as end-to-end, if you take a message as
a single data unit that message will be delivered (in theory) to
whatever host has the MX record for the destination domain, instead IP
packets are routed on a hop by hop basis with a chance of routing
dynamically changing when the packet left the source and is in
transit.

I don't see further forwarding by the receiving MX host as "routing".

-J