Outlook 2010 Error 503

Joined
16 Jan 2012
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Hi, I hope someone can help.

I have outlook 2010, and following a reinstall (I think), most of mu outgoing emails are returned / bounced with the following message:

Server error: '503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.'

I have had to use an old aol account for sending, but this is driving me nuts!

Thanks
 
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