norton internet security = N.I.S

Is this their firewall program? If so, then probably it is blocking TCP port 110 and 25.
Go into its configurations and open these two ports. That should allow e-mail traffic to work again. Unfortunately, I am not familiar with NIS, so I can't walk you through it.

this is a common problem with norton, and why i dont reccomend it.

you can go to the norton support page, type in something like "cant send email in microsoft outlook" and find the solution

there are too many exceptionally good FREE firewalls out there that do a much better job, and dont mess things up

www.valisenterprises.com

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