Re: SMTP troubles (AGAIN!)

["Tom Jedrzejewicz" <tomjedrz@xxxxxxxxx>]

On 4/12/06, James H H Lampert <jamesl@xxxxxxxxxxx> wrote:
>
> "Tom Jedrzejewicz" <tomjedrz@xxxxxxxxx> wrote:
> > You can specify IP addresses from which Exchange is to
> >allow relaying.
>
> Yes, I'm told that's how we did it in the previous mail
> server, but apparently it allowed (by what mechanism I
> know not) somebody from the outside to use it as an open
> relay, which appears to have gotten us on a rather
> significant blacklist.


I think the Exchange 2003 relay prevention is relatively bullet-proof.

Is there a way to either prevent this hijacking from
> happening, or to have the OS/400 SMTP authenticate itself,
> or even to have it relay through something other than the
> mail server (e.g., the firewall in our Linksys router)?


You can have the mail sent directly without relaying; others have explained
how.  Personally, I think you are better off having a single mail hub and
routing all outgoing mail through it.

--
Tom Jedrzejewicz
tomjedrz@xxxxxxxxx