Question for the Experts

[Glenn Steen]

On 14/02/2008, Richard Frovarp <richard.frovarp at sendit.nodak.edu> wrote:
> Mike Kercher wrote:
>  >
>  >
>  > -----Original Message-----
>  >
>  > on 2/14/2008 9:26 AM Ugo Bellavance spake the following:
>  >
>  >> Kevin MURPHY wrote:
>  >>
>  >>> Right - It's a sendmail issue so
>  >>> Ok thanks for pointing this out
>  >>>
>  >> This should be solved with a sendmail ruleset.  I wouldn't know how to
>  >>
>  >
>  >
>  >> write it, though.  Maybe ask fsl?  www.fsl.com.
>  >>
>  >> Regards,
>  >>
>  >> Ugo
>  >>
>  >>
>  > If I remember right, in /etc/mail/access add "To:blocked_domain  REJECT"
>  > and remake the access file.
>  > Or you can change reject to discard if you want it silently dropped.
>  >
>  > --
>  >
>  > I think that would reject/discard the emails from Server B as well.
>  >
>  > Mike
>
> Why not just have Server B pass the message onto Exchange? Seems like a
>  waste to pass it onto a middle man.
>
I agree in principle... but Kevin might have... topologocal
considerations.... we're not aware of:-).

Since I'm no guru on the access file of Sendmail, I did some googling
and found this very friendly (albeit long) article that might be a
help:
http://blue-labs.org/howto/access_hints.php
... If I'm not mistaken, one could have something like
To:exmaple.net REJECT
[IP.of.server.B] RELAY
... in the access file on serverA, and then (since the IP thing should
be more specific(?)) example.net relayed from serverB should get
through.... but nothing else. The big disclaimer here is that what I
remember of Sendmail is ... easily enumerated:-). I know this could be
done with Postfix access though;-).

Cheers
-- 
-- Glenn
email: glenn < dot > steen < at > gmail < dot > com
work: glenn < dot > steen < at > ap1 < dot > se