Did you use the test function in Outlook when you set up the account?
Don't bother with the "Test" function in Outlook - it often fails for no particular reason.
If you did use it, try sending yourself an email the normal way.
The error you receive can be caused by
Incorrect Email settings.
Incorrect scan settings on anti-virus software (if any).
Corrupted account settings.
First, carefully check your settings. Make sure EVERYTHING is spelled correctly, spacing is correct (firstname.lastname@example.org instead of xxx@domain .com), punctuation is correct . instead of ,
One of the most common causes of this error is invalid user name/password. Re-enter them.
Turn off your antivirus email scanning software if all settings are correct.
Since you deleted the account and recreated, the chances are slim that the account settings are corrupt.
Your mail server may also require SSL. I don't know where it is located in Outlook. Find Requires SSL and check the box. Make sure to apply any changes.
If none of this works, post the mail domain which could help us in working with you to resolve the issue.
Also, let us know if you are still receiving duplicate mails in Outlook.
Edited by Queen-Evie, 20 April 2011 - 12:29 PM.