Hi Steve. It is BEFW1154 V2/V3. Sounds similar to yours, but mine has wireless as well. In this case, both the wireless and wired PCs have the same problem with sending email from OutlookXP

>Just curious...what is the model number of the router/firewall? I installed a Linksys BEFSX41 here 2 weeks ago (Etherfast Cable/DSL Firewall Router w/4-Port Switch), and we use Outlook clients.
>
>>
>>Outlook is already set up correctly since it works when I remove the switch. Adding the switch causes it to stop working. The method you described will not work since the problem lies with the configuration of the switch.