Unresolvable sender domain in sendmail

Dear all,

Under sendmail server in redhat 9, I find that emails from one of the real
domain are sent to any users of the sendmail server and the error occurs,
i.e. Unresolved sender domains.
Anyway, such domain is real but not unresloved.
I think the occurrence of this error is due to the statement
"FEATURE(`accept_unresolvable_domains)" in the config file "sendmail.mc".
Anyway, commenting this statement is to prevent spam emails from sending to
the email server.
Welcome for any of your advice, many thanks.

Regards,
John

John <(E-Mail Removed)> wrote:
> Under sendmail server in redhat 9, I find that emails from one of the real
> domain are sent to any users of the sendmail server and the error occurs,

You'll probably be better off asking in comp.mail.sendmail.

They'll probably want to know what version of sendmail you're running, and
then they'll no doubt tell you to upgrade to a more recent version. (What
are you doing still running RH9 anyway?)

Chris

On Fri, 12 Oct 2007, in the Usenet newsgroup comp.os.linux.networking, in
article <(E-Mail Removed)>, Chris Davies wrote:

>John <(E-Mail Removed)> wrote:
>> Under sendmail server in redhat 9, I find that emails from one of
>> the real domain are sent to any users of the sendmail server and the
>> error occurs,
>
>You'll probably be better off asking in comp.mail.sendmail.

He did - Wed, 10 Oct 2007 08:45:43 +0800 Message-ID:
<feh7bn$fk4$(E-Mail Removed)>. His post was ignored, possibly
because it doesn't seem to be asking a question, or at least showing
the "error" message in the logs.

>They'll probably want to know what version of sendmail you're running,
>and then they'll no doubt tell you to upgrade to a more recent version.

RH9 came out of box with sendmail-8.12.8-4, and was updated four times
(8.12.8-9.90 in September 2003, 8.12.11-4.24.1.legacy and
8.12.11-4.24.3.legacy in March 2006, and finally 8.12.11-4.24.4.legacy
in July 2006 which was the month that the last of the very limited
back-ported "support" ended for Red Hat 9). Actually, 8.12.x is still
"available" from sendmail.org, but neither it nor 8.13.x are being
updated. The "current" version of sendmail is 8.14.1 which was released
on April 3, 2007. Free clue for the O/P --> http://www.sendmail.org/faq/

More correct advice would be to update to a supported Linux distribution,
but that's not the cause of his problem.

>(What are you doing still running RH9 anyway?)

Red Hat only declared it end-of-life 3 1/2 years ago - some people are
slow to react to change.

In the original post, the O/P continues:

]Anyway, such domain is real but not unresloved.

Then fix the b0rken name servers so that the domain resolves.

Old guy

On Fri, 12 Oct 2007 15:09:52 -0500, Moe Trin wrote:

> In the original post, the O/P continues:
>
> ]Anyway, such domain is real but not unresloved.
>
> Then fix the b0rken name servers so that the domain resolves.

His nameserver is probably OK. The error occurs when the envelope "From"
domain is unresolvable, not the relay's domain.