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janaFlag for United States of America

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Error "relaying denied. ip name lookup failed" when sending email in Outlook 2007

I get the following error when I send an email via oitlook 2007:

550 5.7.1 <email@domain.com>... Relaying denied. IP name lookup failed [xxx.xxx.xxx.xxx]

I can receive all emails ok, but can't send.  I try sending myself, but same problem.
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Will Szymkowski
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I have Windows 7, where can I locate Active Directory account?
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Another thing is when I test the connection, its successfull.

where can I locate Active Directory account in my Windows 7?
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I just notice something else, when I click on send (on the email screen), the Outbox gets empty fast and the configuration is set to every 30 mins.  Yet, I click Send/Receive, and I dont' see anything, just the error message (i sent it to myself).
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Hi there, who is your Internet Service Provider?  They often provide a free SMTP service (ie a service that allows you to send email via their servers).

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I think I found the cause.  The domain where I was located had a firewall setting; they checked and fixed it and now all is OK
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ok