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Knowledgebase: Internet
550 Authentication is required for relay (Outlook / Outlook Express)
Posted by Guruh Mandala, Last modified by Guruh Mandala on 02 November 2010 12:21 PM
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The reason for this error is that your email server requires SMTP Authentication to send outgoing mail. In order to resolve this issue you will need to configure your email client (Outlook, Outlook Express, Eudora, Thunderbird, etc) so that you are an authenticated user. For Outlook do the following:
For Outlook Express do the following:
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