error 530 authentication required (Full Version)

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IanSutherland -> error 530 authentication required (25.Jul.2005 7:38:00 AM)

I am trying to send mail to a particular domain, which I have been able to do without problem up until this weekend, we have made no changes to our configuration but are now getting these NDR responses
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<ourservername.ourdomain #5.5.0 smtp;530 Authentication required>

we have an Exchange 2000 Server, I am not sure if this is a problem at the recepients end or ours. I can send mail to the recepient from Gmail, and from another site with Exchange without problem.
Any ideas on this would be appreciated

MadMike -> RE: error 530 authentication required (26.Jul.2005 1:17:00 PM)

Need a bit more information

Is the sending mailbox on the same server that is attempting to send the email for you?

(seen this in my production system) the SMTP gateway has lost connectivity to the AD DC / GAL server. The services may need to be restarted / server may need to be restarted.

If this not the case, need to perform more trouble shooting


[ July 26, 2005, 01:26 PM: Message edited by: MadMike ]

IanSutherland -> RE: error 530 authentication required (28.Jul.2005 7:54:00 AM)

Hi Mike,
Thanks for your reply, after further digging I discovered that the mail servers for the domain I was sending to ( could not be resolved with the BT DNS servers we use, I tried to resolve the name on a different site and could resolve it fine. Eventually this seemed to have been sorted as it is now working.
What I would like to know is why the error message has nothing to do with the actual problem, if it said something like Name cannot be resolved, it would be more helpful, I am having similar error messages when testing emails to a newly created domain that hasn't propogated its IP address around Internet DNS servers, although that error says "relaying not allowed" What's all that about?
Thanks anyway

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