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501 5.7.1 error

Just installed a new exchange 2003 server sp2 and am getting this error on only one XP machine and only to one particular e mail domain at teh moment:-

You do not have permission to send to this recipient.  For assistance, contact your system administrator.

<SERVER.xxxxxxx.local #5.7.1 smtp;501 5.7.1 195.74.118.74 DSL4 rDNS source IP detected - sender, please use your ISP's mail server>

xxxxxxxx   is the customer name.

All other 25 PC's are fine and this one is okay on all other e mail?

Matt
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matthewtwynham
Asked:
matthewtwynham
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2 Solutions
 
SembeeCommented:
There are a number of errors there.

1. Your server is announcing itself as a domain ending in .local
That isn't valid and will trip antispam filters.

2. The message looks like it is indicating that your reverse DNS is wrong. So you will need to get that changed by your ISP.

http://www.amset.info/exchange/dnsconfig.asp

Simon.
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matthewtwynhamAuthor Commented:
How do I change the server to reflect the .co.uk rather than the .local?
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SembeeCommented:
Did you look at the web page I posted above? It is all outlined on there.

Simon.
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matthewtwynhamAuthor Commented:
Thanks Simon

I did read the page, which suggested setting up reverse DNS and MX records.

The MX records were already correct, after setting up teh reverse DNS we still had teh same problem.

In teh end I had to set up a new SMTP connector,using teh ISP as a smart host and just use it for the specific domain that we were having problems with, my guess is that there will be more in the future, but time will tell.

Many thanks for your suggestions.
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SembeeCommented:
You can set all the reverse DNS records that you like - sometimes a remote domain just will not accept your connection for whatever reason. I have had clients on expensive leased lines with correctly registered IP addresses, reverse DNS etc, and there were still a hard core of a dozen domains which would not deliver correctly.
As such, with all deployments that I now do, I have an SMTP Connector already configured, with a dummy domain, just waiting to have other problematic domains added to its list.

Simon.
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