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Re: [ietf-smtp] Private Domain Names and the EHLO/HELO Command

2013-03-26 19:54:26

On Mar 26, 2013, at 5:50 PM, hector <sant9442(_at_)gmail(_dot_)com> wrote:

2) If squared bracketed, by specification assume a dotted IP address and by 
SMTP specification this allows for a simple SMTP compliancy check to verify 
the IP of the connection matches the provided IP literal.   You are allowed 
to do this because when a IP Literal is presented, it MUST machine the 
connected client IP address.  This yields a pretty high spam rejection with 
100% zero false positives after at least 10 years of automated operations.

It'll fail all the time in the case of an MUA behind a NAT - which is going to 
be pretty common in the case we're discussing of a dumb SMTP client submitting 
to a smarthost.


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