Re: Getting error 5.7.1 on new ISP

Jordan <nospam@xxxxxxxx> wrote:
Just changed over to a new ISP (XO Communications). I wanted to just
change my Exchange 2003 SP2 server to use their SMTP server as a
smart host

Why? That's not the best way to go. Much better to deliver directly whenever
possible, for reasons of performance/efficiency/security/ease of
troubleshooting.

but they have this dumb rule where I have to setup every
user on their system as well so when mail comes from jsmith, bjones,
jdoe, etc @mydomain.com it comes from an address they know. They
won't just allow it to come from my IP. This is a hassle to keep up
to date and they also charge per account.

Oh, don't do that. That's insane. If you've got a business account,
complain - and if you don't have a business account and must absolutely use
a smarthost then find someone else (DynDNS MailHop Outbound works & is
inexpensive).

Instead I requested that they setup a ptr record for
myemailserver.mydomain.com which is my Exchange 2003 server's
external IP address (internal address is 192.168.x.x). Now even
though that has been setup for 5 days and I can reverse lookup the IP
address 209.x.x.x which resolves to myemailserver.mydomain.com I am
getting 5.7.1 no relaying messages from some companies. Here is the
exact return message:
====================

Your message did not reach some or all of the intended recipients.

Subject: Test
Sent: 3/3/2008 11:08 AM

The following recipient(s) could not be reached:

EI_Sales@xxxxxxxxxxxxxxxxxxx on 3/3/2008 11:08 AM
You do not have permission to send to this recipient. For
assistance, contact your system administrator.
<myemailserver.mydomain.com #5.7.1 smtp;501 5.7.1 This
system is not configured to relay mail (r) from
<jcnolan@xxxxxxxxxxxx> to <EI_Sales@xxxxxxxxxxxxxxxxxxx> for
209.x.x.x>

That's not an error from your server and if you've got a static IP & a PTR,
you're pretty good (although you should perhaps do an SPF record as well).

Are these recipients people you could successfully e-mail before you changed
ISPs? The issue would appear to be in their side.


.

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