Open Outlook Express, then Tools, then the Accounts settings, then the "Mail" tab. Once there, highlight your account, then click on the "Properties" button and make sure the Incoming/POP3 and Outgoing/SMTP listing is the correct for Comcast server settings. (You may need to check with Comcast for those settings but I believe Comcast's outoing/SMTP should be "smtp.comcast.net" and incoming/POP3 should be "mail.comcast.net".) Next, click on the "Advanced" tab and CHECK or UNCHECK the box next to "This server requires a secure connection (SSL)" (Most require this box to be CHECKED but you may need to uncheck it if it's not working like it's supposed to.) Click on Apply, then OK
Hope this helps.
I am a snowbird and have just moved from Idaho to Tucson for a few months. Comcast hooked me up this morning. In Idaho I use Time Warner. In Tucson, it's Comcast. I always use Outlook Express and have XP Pro. I can recieve OE email, but cannot send. I went to Properties and tried to select OE as default email, but it's greyed out and cannot figure out how to send emails from OE as I always did.