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Unable to send Email

By kyle ·
One of the workstations in our LAN has a curious problem. When we attempt to send email (using Outlook Express) from this computer, we get an error message (copied below). It LOOKS like an authentication problem, but I've triple- and quadruple-checked the settings and they're correct. I've even imported/exported settings from other stations, with no luck. This does not happen on other workstations. Any ideas?

Error message is as follows:
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'kyle@lewisartgallery.com'. Subject 'test', Account: 'PTB', Server: 'pop.omah.qwest.net', Protocol: SMTP, Server Response: '553 relaying denied.', Port: 25, Secure(SSL): No, Server Error: 553, Error Number: 0x800CCC79

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553 Error Events

by BFilmFan In reply to Unable to send Email

Most likely your SMTP authentication is failing for some reason.

http://office.microsoft.com/en-us/assistance/HA011128331033.aspx

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by kyle In reply to 553 Error Events

yes, but any idea why? I've already read the Microsoft document you referenced, and have tried all the solutions it suggested.

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Had same Problem.

by leopmahon In reply to Unable to send Email

I could receive mail from Outlook Express but got error warning when trying to send mail. Eventually, I tracked the culprit - IE7. Uninstalled IE7 form control panel-make sure Updates box is ticked. After a restart Outlook Express works fine.

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