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550 5.7.1

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550 5.7.1 - 4.Feb.2003 11:52:00 PM   


Posts: 3
Joined: 4.Nov.2002
From: Australia
Status: offline
Users receive NDR for some e-mails sent out.

"You do not have permission to send to this recipient. For assistance, contact your system administrator.
<server1.abc.com #5.7.1 smtp;550 5.7.1 <recipient@xxx.com>... Relaying denied. IP name lookup failed [x.x.x.x]>"

the user is sending via another Exchange server in the organisation. I tried including senders domain in Default Policy, Properties, Email Addresses(Q289553), but I cannot be inputing domains as the list of NDR grows. How can I make sure sender is able to send mails without NDRs. Please help! "[Frown]"
Post #: 1
RE: 550 5.7.1 - 5.Feb.2003 2:55:00 PM   


Posts: 14
Joined: 9.Dec.2001
From: Toronto
Status: offline
I had an issue that was very similar, if not identical to the one you have.

To resolve the issue, I had to do a couple of things...

1. verify that your DNS is resolving the Domain Name correctly. You can do this several ways.. First, validate the mail record by pinging it. It may or may not respond, this doesn't matter. Just make sure the IP is correct. You can velidate the correct IP by doing an nslookup using the domain names Start of Authority DNS.

2. Try sending an email using another account on your domain. this would narrow down what you need to focus on... the user account or the exchange server/DNS.

Just a couple diagnostic tips.

In my case, it was an issue with my DNS AND the external users account. What a pain that was..

Good Luck


(in reply to AnnieL)
Post #: 2
RE: 550 5.7.1 - 6.Feb.2003 1:09:00 AM   


Posts: 3
Joined: 4.Nov.2002
From: Australia
Status: offline
Thanks for that. I have tested the DNS and user from another exchange server are able to send mails to the same address without problems. In the meantime I managed to get around the problem by granting relay to the group of computers sending via the secondary exchange server in SMTP virtual settings of my primary exchange server. Problem solved!

(in reply to AnnieL)
Post #: 3

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