I have received the following error code

Delete the photo email, create a new one, and try to send it again.

Server: 'smtp.prairieinet.net'
Windows Live Mail Error ID: 0x8CCC0003
Protocol: SMTP
Port: 25
Secure(SSL): No

I have contacted my ISP and they have referred me to you. I have attempted to block my Norton anti-virus which has no effect. I can receive e-mails but can not send any with or without attachments. I was using Live mail 11 but have upgraded to 12 with no effect. My out going server is SMTP set at 25 and doesn't use encription. I have a second computer set up with Windows XP, with Outlook and the same Norton antivirus, and I can send and receive e-mails.

Any suggestions? Thank you.