Re: Exchange 2003 SBS #4.4.7 NDR TO OUR SERVER

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Any other messages error messages?

If you are using the DNS service to send your mail, you need to confirm
whether you have a "real" static IP or a "leased" static IP? The problem is
becoming more widespread - lthe cheaper leased IPs are treated as Dynamic
IPs and may be bounced by those email servers which perform reverse-DNS
lookups.

The only recourse is to get a "real" static IP, or use your ISP's mail
server for outbound forwarding.

Regards,
N. Hughes

<jaellman@xxxxxxxxx> wrote in message
news:1152483295.745514.4700@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I've got a situation where my client is telling me (and I've seen) a
few domains are unable to send email to us without getting 4.4.7 errors
returned to the sender. I've disabled all incoming mail filters (IMF)
on the exchange server, from the outside world from multiple IP
addresses I can telnet to 25 to the mail server as well as MANY MANY
MANY users are able to send mail to this exchange server, only a few
cannot.

I'm looking for some general guidance on where I can look from here to
figure this out.

I've done the following:
-Disabled SMTP filtering on Exchange
-Disabled SMTP FIltering on PIX
-Routed all SMTP Traffic through our ISP via Virtual Server (there is
no SMTP Connector)
-Checked SMTP logs and found NO CONNECTIONS from these domains
attempting to send mail to us
-Check DNSREPORT for any DNS errors on our DNS Server...

Anything else I can look for?!? Thanks!

~Jeff



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