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Re: [ietf-smtp] Endless debate on IP literals

2020-01-01 12:38:59
In article 
<482744ba-3a37-1fd8-48dd-0d8f58524abe(_at_)network-heretics(_dot_)com> you 
I've been wondering if there's a need to talk about (for lack of a 
better term) "pre-submission relaying" which happens when a message is 
(for whatever reason) not initially submitted to a real submission 
server that does whatever sanity checking and fixup are needed to make 
the message suitable for relaying into the global email system.

I don't see any need to tie ourselves into knots about this.  If you
want multiple submission hops before the real submission server, you
don't need to do anything special beyond ensuring that at each hop,
the server end has some way to limit who's relaying through it.  It
might be by IP range, or client authentication, or any of a variety of
other hacks invented over the years.  (POP-before-Submit, known in the
old days as POP-before-SMTP, comes to mind.)

My DMA submission servers do submision relay.  It works fine.


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