Also, SMTP is store-and-forward and [...] multiple hops.
It was designed that way, for UUCP bang-paths
I used UUCP for a long time, and I can assure you that SMTP's design
had nothing to do with bang path hacks. Please do your homework.
Dave Crocker, who wrote many of the relevant documents, might be able
to point to some useful references.
but in practice for a very long time now, especially since running
open relays began being poor form, SMTP has been sender-realm systems
communicating directly to recipient-realm systems.
Hmmn. This might be a good time to learn more about the way that
non-trivial mail systems work. There is a lot of multi-hop SMTP,
and it has nothing to do with open relays.
R's,
John
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