I have recently changed providers and trying to send from my new e-mail address.  I keep getting this message.  Was wondering if I can go anywhere to change the Server information?

An unknown error has occurred.

Subject 'School'
Server Error: 554
Server Response: 554 Postmaster Code 1 - Your IP 70.27.74.41 is not authorized to send mail through our server. To contact Cogeco Cable, please visit http://postmaster.cogeco.net  Votre adresse IP 70.27.74.41 n'est pas autorisée à envoyer des courriels par notre serveur. Pour contacter Cogeco Cable, veuillez visiter le site suivant : http://postmaster.cogeco.net
Server: 'smtp.cogeco.ca'
Windows Live Mail Error ID: 0x800CCC6F
Protocol: SMTP
Port: 25
Secure(SSL): Yes