Hi all. This is regarding my comcast.net acccount. Currently, I have "cwmx.com:25" specified as my Outgoing Server. I can send e-mails using EDGE, but no so with Wi-Fi.
I called my ISP, CableOne, and the support guy gave me a specific outgoing server address: authmail.cableone.net It requires password authentication, but it works anywhere. I would suggest you call Comcast to see if they have something similar for you.