Most email clients will try to read from the mail server the correct settings for you. The minimum you need to know is shown below with yourdomainname being your registered domain name eg yws.com.au

Adding a new email account may appear difficult on the iphone but the software will try to find the correct setting from the server and do it all for you. Things can go wrong so here is an explaination to get your phone going with email from YWS.