[Mimedefang] Revisit: Filtering on HELO
philipp_subx at redfish-solutions.com
Sat Mar 17 13:53:53 EST 2007
Graham Murray wrote:
> "Kevin A. McGrail" <kmcgrail at pccc.com> writes:
>> SHOULD means in RFC-speak that it should do what is said unless you
>> understand the ramifications of not following the recommendation. In
>> short, I see nothing in the RFC that could argue that sending just the
>> hostname is proper. It's either the FQDN or the address literal.
> And an earlier section (2.3.5) actually has a MUST NOT covering this.
> "The domain name, as described in this document and in , is the
> entire, fully-qualified name (often referred to as an "FQDN"). A
> domain name that is not in FQDN form is no more than a local alias.
> Local aliases MUST NOT appear in any SMTP transaction."
That would mean then that an unroutable address like
[192.168.1.3] is also a "local alias", and hence forbidden.
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