Microsoft Outlook Not Sending Emails

Hi all,

I am just wondering why this is occuring.

I try to send emails and it comes back with this error
Your message did not reach some or all of the intended recipients.

Subject: Hi From Gold Coast
Sent: 15/07/2007 11:50 AM

*REMOVED EMAIL ADDRESSES AND STRINGS THAT CAN BE INTEPRETED INTO EMAIL ADDRESSES, AS PER SITE'S RULES*

Im just wondering how to fix the issue. I can recieve msgs from Afterdawn and anyone but i cant send. Is it just that i need to re enter my account info again or something??

Any help would be great.

Thanxs