International outgoing email not delivered

I have the same problem as posted here (http://forums.cox.com/forum_home/internet_forum/f/5/t/6128.aspx) and instead of opening an old thread decided to start a new one. When I'm out of the country, Cox usually blocks my outbound email from being delivered. It shows up correctly in my Sent Mail folder, but never is actually sent to the recipient.

The previous post mentioned using another SMTP server. My hotel's ISP is not "open", meaning it requires a login and password, which I don't have.

Any suggestions for my outbound email to be delivered? Webmail does work, but I'm trying to send pictures from my iPhone and it can't be used for that.

Thanks.