Re: [cobalt-users] Sendmail error messages?

["Steve Werby" <steve-lists@xxxxxxxxxxxx>]

"Steve West" <wppiphoto@xxxxxxxx> wrote:
>
> I'm trying to figure out what all of these messages mean that are being
> generated on a Raq3 box? Is someone trying to use our box to relay spam
> mail? And if so, how can I stop them?
>
> My fear is that stuff is getting through because these error messages are
> only stating that "Sender domain must exist". So, I assume that if the
> sender domain was a valid one, then sendmail will relay their e-mail?
> Correct me if I'm wrong.
>
> By the way, this raq box has been updated w/ all the latest updates. What
> I'm wondering is we used to have an old version of pop-before-smtp on this
> box and then we installed Cobalts version. Could this be part of the
> problem?
<snip>
> May 11 08:58:50 dns1 sendmail[23891]: IAA23891: ruleset=check_mail,
> arg1=<estokes170@xxxxxxxxxxxxxxxx>, relay=cdshop.photodisc.de
> [193.97.202.146],
> reject=501 <estokes170@xxxxxxxxxxxxxxxx>... Sender domain must exist
</snip>

It simply means sendmail is configured so that mail sent from a domain that
doesn't resolve is not delivered to your local users b/c it's assumed to be
spam.  The email in the log record above was sent through a mail server at
cdshop.photodisc.de, not your own mail server.

--
Steve Werby
President, Befriend Internet Services LLC
http://www.befriend.com/