RE: Strange email sending problem

If you haven't already use the nslookup command on a PC's command line
somewhere and you may see...

C:\Documents and Settings\Ken>nslookup PEN400.3cc.co.wayne.mi.us
Server:  ns11.attbi.com
Address:  204.127.199.8

*** ns11.attbi.com can't find PEN400.3cc.co.wayne.mi.us: Non-existent domain

<peezed>attbi.com is a domain name that we block as it seems to be a source
of quite a lot of our incoming spam.</peezed> If I were you I'd contact your
ISP and have them explain it to you. 

Besides reverse lookup solutions that may be blocking you, so may the
attbi.com domain be blacklisted on one or may of the blacklist providers.

HTH,

Ken Slaugh (707) 795-1512 x118
Chouinard & Myhre, Inc.
http://www.cm-inc.com/


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Todd Kidwell
Sent: Friday, April 02, 2004 4:59 AM
To: midrange-l@xxxxxxxxxxxx
Subject: RE: Strange email sending problem

We ran into this problem last week.  We could send mail to some sites (such
as yahoo.com), but not others (such as excite.com).  The message was the
same.  We never fully understood why it happened, but the prevailing theory
is that some sites require a reverse DNS lookup and others don't.  When
coming from the AS/400, our domain was PEN400.3cc.co.wayne.mi.us.  However,
since this isn't registered on the internet, the address could not be
validated.  Our corporate (for lack of a better term) email domain is
3cc.co.wayne.mi.us and is registered on the internet.

The solution (or work-around) for us was to change the SMTP domain for the
users on the AS/400 to match the corporate mail server.  This "masks" the
e-mail to look as if it came from Groupwise instead of the AS/400.

Let me know if you need more details.

Thanks,


Todd Kidwell (Netstar)
AS/400 System Administrator
(313) 224-0578

>>> "Jeff Crosby" <jlcrosby@xxxxxxxxxxxxxxxx> 04/01/04 03:39PM >>>
> A few things I would be concerned about, your AS400 does not seam to 
> be an MX record in your domain, your IP address resolves back to a DSL 
> name. I would have to bet that they check email going to a phone 
> pretty close to make sure it is not spam. And that stuff makes it look 
> like spam.

I gather what you are saying is there is a problem because our iSeries at
192.168.0.1 is "as400.dilgard.com" on our internal network and my email
address is "@dilgardfoods.com"?  Out iSeries does not have an externally
routable IP address.  It's behind a firewall and router.

I'm dense on this stuff.  If the above is what you're trying to say, you'll
have to explain it in more detail.  Why isn't it a problem when I email
elsewhere?

--
Jeff Crosby