[Mimedefang] Rejecting forged senders - comments?

Kees Theunissen theuniss at rijnh.nl
Wed Sep 20 07:05:29 EDT 2006

On Wed, 20 Sep 2006, Steffen Kaiser wrote:

> On Wed, 20 Sep 2006, Jan-Pieter Cornet wrote:
>> On Wed, Sep 20, 2006 at 01:44:22AM -0700, John Rudd wrote:
>>> But:
>>> 1) to reject based on the content of the HELO string is an RFC violation
>> This is a blatant and oft-repeated lie. Section 4.1.4 in RFC2821 contains
>> very specific wording. Only an IP mismatch is disallowed as a reason for
>> rejection. For any other violation, even if it's a local policy violation,
>> you are allowed to reject the HELO/EHLO argument.
> RFC2821 speaks about EHLO, what about HELO?

Section 2.2.1:
   Unless the different characteristics of HELO must be identified for
   interoperability purposes, this document discusses only EHLO.

Section 4.1.4 doesn't mention different characteristics of HELO
so this section applies to both HELO an EHLO.



Kees Theunissen
F.O.M.-Institute for PlasmaPhysics "Rijnhuizen", Nieuwegein, Netherlands
E-mail: theuniss at rijnh.nl,  Tel: (+31|0)306096724,  Fax: (+31|0)306031204

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