[ale] [OT] Sendmail (?) woes

[Jonathan Rickman]

On Wed, 22 Jan 2003, Joe wrote:

> Hi folks,
>
> I'm trying to send mail to someone at sun.com, but my mail
> is always returned with:
>
> >    ----- The following addresses had permanent fatal errors -----
> > <andrew.holt at sun.com>
> >     (reason: 501 <joe at orado.localdomain.private>... Sender domain must exist)
> >
> >    ----- Transcript of session follows -----
> > ... while talking to mx3.sun.com.:
> > >>> MAIL From:<joe at orado.localdomain.private> SIZE=1821
> > <<< 501 <joe at orado.localdomain.private>... Sender domain must exist
>
> Why does my delivery agent say "From:<joe at orado.localdomain.private>"
> when I'm explicitly setting the From: line to "jknapka at earthlink.net",
> (below)? Is this a sendmail.cf thing (shudder)?
>
> Thanks in advance (and hoping I can even send this message),


Another example of a failed attempt to stop spam. Set your local host name
to something real. For example, if you look at my headers you'll see
abacus.xcorps.net as the FQDN. Now there is no DNS entry for that, but the
mail server will still buy it. I send mail to Sun all the time. Sooner or
later, someone will turn on reverse lookups and I'll have to take a
different approach, but for now it works for me as well as the spammers.

--
Jonathan Rickman
X Corps Security
http://www.xcorps.net

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