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Re: [ietf-smtp] IETF Policy on dogfood consumption or avoidance - SMTP version

2019-12-23 10:51:10

On Dec 23, 2019, at 11:34 AM, Hector Santos 
<hsantos=40isdg(_dot_)net(_at_)dmarc(_dot_)ietf(_dot_)org> wrote:

I agreed and I have admitted I have a single rule for comparing the 
ip-literal with the connection IP. Mismatches are rejected.  There are some 
cases (MUA behind the NAT) where there are a FP, resolved with authentication 
requirements. I believe this test is a correct technical SMTP check compared 
to a subjective, nondeterministic conclusion  to block all ip-literals that 
technically violates SMTP.

I believe that NATs within the ipv4 network (not merely on the periphery) will 
become increasingly commonplace, for as long as there is a public ipv4 
Internet.  I also believe that the HELO/EHLO tag is really only usable for 
inclusion in Received fields and to identify the client system within its own 
environment.  So any checks on validity with respect to the server environment 
are dubious at best and may do harm to the protocol.  This applies equally to 
IP address literals and names.  

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