> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Les Mikesell
> Sent: Thursday, December 23, 2010 8:30
> To: centos@xxxxxxxxxx
> Subject: Re: sendmail / logwatch relaying issue -
> driving me crazy
>
> On 12/23/10 3:44 AM, Götz Reinicke - IT-Koordinator wrote:
> > Hallo, *<:-)
> >
> > may be I'm to tired to see the solution, maybe someone can
> give me a hint?
> >
> > I do have a couple of servers, sending the daily logwatch
> report to a
> > central support email account.
> >
> > Some servers do have DNS A and CNAME records. On my mailserver
> > relaying for the servers is allowed.
> >
> > Only one server drives me crazy, getting user unknown or releaying
> > denied messages.
> >
> > Any idea, how to debug this issue? I'd be glad to fix this as a
> > christmas gift. I could provide logmessages of course.
> >
>
> If there is an MX record for the target address, it will go
> there instead of to
> the A record for that name. The receiving server will
> usually try to resolve
> the From: host address and reject if it can't, so the sender
> must have a valid hostname in your DNS (or turn off that
> feature). If the receiving server doesn't accept for the
> target domain/host address you'd get the relaying denyed
> error. If it does accept for the domain but does not have
> the user in the address you'd get the user unknown error.
>
In your /etc/mail/sendmail.mc:
dnl # Uncomment and edit the following line if your outgoing mail needs to
dnl # be sent out through an external mail server:
dnl #
define(`SMART_HOST',`mail.pdinc.us')dnl
* the mail.pdinc.us resolves to a different ip inside as compared to the public
dns entry
Each box in your network should send the mail to a central smtp server which
allows relaying from your network. We have 2-5 new virtual machines every day,
they usually don?t last more than a few days. If we had to admin that centrally
either by dns or mail server config we would go bonkers. This way every new
machine is responsible for its self.
-Jason
--
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- -
- Jason Pyeron PD Inc. http://www.pdinc.us -
- Principal Consultant 10 West 24th Street #100 -
- +1 (443) 269-1555 x333 Baltimore, Maryland 21218 -
- -
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This message is copyright PD Inc, subject to license 20080407P00.
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