Ahh, that explains why I can't send when on EDGE or a non-Cox wireless network (which is another issue since the smtp changes again). So, what might the setup be when we go between the two? Just remember to manually change it, or is there a way for it to switch between the two smtp's automatically?
I finally got my cableone outgoing mail to send on EDGE. I called cableone support, and their authentication outgoing server is authmail.cableone.net and does require password authentication.
I had previously tried to setup two separate accounts on my iPhone. One with regular settings for cableone, which worked (sent mail) when I was at home on my network. And another for outgoing mail via EDGE when I was away from home using authentication. However, once the iPhone mail software tried once to send mail with the home settings account, it wouldn't try again with the second account via authentication. Either way works at my home network so I'm going to retain one account on my iPhone with the authentication for outgoing.
I advise you call support for your ISP for authentication settings.