ERROR with Microsoft outlook 2003

Hi all,

i have a problem with my yahoo account on the sending side but i can recieve ail fine. i have tried all 3 ports with an without SSL on them and used SSL override with no result. everytime i get a message saying tha the port is wrong and i have checked my network adapter. Another computer where i am works wirelessly and does send email so i don't understand what my problem is. all help appreciated!