RE: Strange bind/sendmail issue
Hi,
> -----Original Message-----
> From: Peter Dumpert [mailto:pdumpert@innovativebusiness.net]
> Sent: Wednesday, September 27, 2006 9:00 PM
> To: debian-isp@lists.debian.org
> Subject: Re: Strange bind/sendmail issue
>
> Its possible a combination of the following features would cause it:
>
> FEATURE(`always_add_domain')
> FEATURE(`accept_unresolvable_domains')
There's only always_add_domain defined. But a good point there, I'll mess around
with that at the weekend when there'll be less traffic on the host.
THX for pointing that out.
Erik
>
> I've never used the two together, but it sounds like they
> might do what you're describing.
>
> Peter A. Dumpert
> Innovative Computer Services, LLC
> The Diamond Standard of Internet Business
> P: 732-683-0092 x 102 F: 732-577-9390
> http://innovativebusiness.net/
>
>
> Erik Dörnbach wrote:
>
> Hello list,
>
> at one customer's site I encountered a really strange
> issue, regarding sendmails handling of emails with
> non-existing domains as recipient... running bind9 and sendmail.
>
> In detail, for what ever reason a mail with
> non-existing domain may enter the sendmail queue, it appears
> with the customer's own domain trailed to the non-existing
> one, making it appear as if it was a subdomain, likewise it's
> treated as one.
>
> For example:
>
> - Customer has domain "customer.com", the server in
> question is the mx for that domain
> - Mail enters the queue with recipient address
> "user@doesnotexist.net" <mailto:user@doesnotexist.net>
> - Mail is listed in queue/log as
> "user@doesnotexist.net.customer.com"
> <mailto:user@doesnotexist.net.customer.com>
>
> What is going on? I don't have this phenomen on any
> other of my machines with quite the same configuration
> running. It's not much of a problem, but I would like to
> understand what is going on there, either on the resolver or
> sendmail. And have a cleaner mail queue of course! ;)
>
> I can give more information about sendmail config, bind
> config, ns queries and so on as needed on request.
>
> The only thing that caught my attention, the
> authoritive NS for "customer.com" (not under my control) does
> some special magic to make all queries to non-existing hosts
> under "customer.com" point to itself. I'm not sure what that
> is for, but that's why sendmail tries to deliever those
> emails to that NS.
>
> But then this can't be the source of the problem... I think.
>
>
> THX and with best regards,
>
> Erik
>
>
>
>
>
>
>
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