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This is the comment you were replying to, attached to the weblog Obfuscating source IP for SMTP AUTH in Exim4

#2 Re: Obfuscating source IP for SMTP AUTH in Exim4 Posted by lee (193.82.xx.xx) on Wed 28 Feb 2007 at 10:46 Because I'm interpreting "SMTP environment" as traditional message transmission using SMTP over port 25. Whereas message submission over port 587 is a separate, albeit SMTP compatible, protocol. An relevent example of this is section 8.8 of RFC4409 which allows for header rewriting to match local policy. Yes, I'm deliberately fiting my interpretation to a) what I consider the cleanest solution (i.e. doesn't involve using false information in a trace field) b) what is actually being implemented by many sites in the field.

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