Just want to add to rkaufmann87's answer a little.
Almost all Internet Service Providers tell you they don't have support for Mac Computers. This not entirely true, a few years back this was true. However, as the years have progressed so have the ISP's when they realized there are more and more Apple users they had to deal with and so they have since done a much better job over recent years. They still have a little ways to go but they have come a long way. Here is a special note. All Internet Service Providers use the exact same technology for Internet Service so in one respect it tells you some don't have a clue what they are doing when it comes to dealing with Apple Products.
Configuring Mail for your email account
Hopefully this has helped explain things to you.
Don Morgan