[Cialug] MTA HELO

[Josh More]

What happens if you add cq1023 to your hosts file?

-Josh

Please pardon the brevity of this electronic missive.  It originated from a
handheld computing device which has less than ideal data input
capabilites.  Thank you for understanding.
On Jan 12, 2014 12:36 PM, "Kevin Smith" <kevin at linuxsmith.com> wrote:

> #1 It's not A FQDN. Something like "cq1023". There is no attempt to resolve
> the domain. It just has to correct syntax.
> On Jan 12, 2014 10:45 AM, "Paul Gray" <gray at cs.uni.edu> wrote:
>
> > On 01/12/2014 09:35 AM, Kevin Smith wrote:
> > > That's my opinion as well. Relevant RFC is this I believe:
> > > http://www.freesoft.org/CIE/RFC/1123/90.htm
> > > On Jan 12, 2014 9:15 AM, "Paul Gray" <gray at cs.uni.edu> wrote:
> >
> > There are two facets in play here.  Here's my take keeping in mind that
> > I had gotten this wrong in the past:
> >
> > First off, the domain in the HELO must be a valid domain, host or
> > address literal.  That requirement is laid out in section 2.3.5 of the
> > RFC 5321.  It doesn't state that it needs to be YOUR server or YOUR
> > domain, it just needs to be valid so that the verification step can take
> > place.
> >
> > During verification of the HELO step, if the specified domain doesn't
> > reverse resolve to the IP address of the connection, it's not supposed
> > to be a fatal error, as described in section 4.1.4., but you are to
> > instead insert headers in the message stating the lack of verification.
> >
> > Which of the two situations is at play here?  Are they issuing
> > "notarealdomain.loc" in the HELO, or "iam.notreally.microsoft.com"?  The
> > former would be rejected outright because I can't do verification
> > lookups on a nonexistent domain, but the second would be a soft fail,
> > because you aren't reverse-resolving back to the domain you claim to be?
> >
> > -PG
> >
> >
> >
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