I have set my email up on my iPhone 5 and iPad and can receive emails but they won't send. The service provider is unable to help. The account is setup under other and the server name is out.upnet.net.au. Any suggestions.

I am not sure if this issue is going to help you but lets give it a try.

I know that where im from, which is the Netherlands, I am not able to sent e-mails from my iPhone or any other mobile device by using 3G or a random WIFI acces point. The provider only allowes you to sent e-mails when you are connected to a network of there own. Which means if you have provider "101" and your email settings are set up for this provider in your iPhone but your using the network of a friend of yours which is provider "202" you cannot sent emails from his network. Though you can receive them you may not sent.

As I said, I am not aware if this issue is the same for you totaly depents on the country and provider your using.