When setting up an email account on a samsung d600 with t-mobile what is the pop3 server section requesting?

My email address for the account is my yahoo mail account. It is asking for the name or IP address of your email providers incoming mail server.
When setting up an email account on a samsung d600 with t-mobile what is the pop3 server section requesting?
The Pop3 details it is requesting is the mail server you use to get your emails, normally something like pop3.blueyonder.co.uk, you will be able to get this information from the company that you get your emails through.