Norton 2006

After installing norton 2006 on my computer I have been unable to send
emails to a comcast email address. I have checked with comcast and my
IP address is not blocked. I can send thsi person email if i access my
email provider online but no through outlook or outlook express or
incredimail. None of these program have blocked the comcast email. I am
frustrated can anyone help with this problem. Contacting Norton is very
frustrating and expensive.