I discovered a frustrating issue with the Wifi/EDGE combination that prohibits me from sending mail in both. I was hoping that someone's found a work-around. When associated with WIFI, the iPhone is connected to my router and comcast's cable network. When on EDGE, the iPhone is obviously not on comcast's network. Apparently, SMTP port requirements change based on your location (ie on or off the network). So, with the iPhone, you'd need to switch outgoing mail-server ports whenever you jumped on or off the wifi--what a pain. I spoke with the comcast people through their live chat service, and they were less than helpful. I got a number of responses: 1.) All macs must use port 587 regardless of location. 2.) There are different port configurations for different locations (which seems to be the case) 3.) That comcast has begun flagging accounts for spamming activities, and cutting off port 25 for those accounts. Port 25 is apparently capable of operating in both environments, so i had it restored for my account. Still no good. Anyway, i was wondering if anyone else has looked into this or found a solution.