On Sat, Jul 03, 2004 at 02:56:40PM -0400, Greg A. Woods wrote:
> The SMTP client "MUST" give its proper canonical hostname in the
> HELO/EHLO greeting (or a valid address literal). It "MUST NOT" lie and
> give some other name which does not resolve to the address it connects
> from.
That's a fantastic interpretation of 2821.
3.6:
- The domain name given in the EHLO command MUST BE either a
primary host name (a domain name that resolves to an A RR) or,
if the host has no name, an address literal as described in
section 4.1.1.1.
It says nothing about resolving correctly as a PTR. In fact, that you
can give an address literal implies that IP addresses should not be
resolved back to a hostname.
--
Avleen Vig
Systems Administrator
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