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  3. April 2006

Re: SMTP troubles (AGAIN!)

You may have run into trouble by permitting relaying by Domain name instead of IP. Relaying by IP is the correct way to do this, particularly if the IP is an private one and from a single server.
Another way that might work, is to just send from the OS/400 SMTP under a different Internet Domain. No receiving, right? Make the correct entries in the Public DNS records, and you should be able to make things flow OK. 

Best regards,

Fritz Hayes

James H H Lampert 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.
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)?
I'm grasping at straws here, and I don't know enough about the mechanics of email to even be sure I'm asking the right questions (nor am I the email administrator). 

--
JHHL

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