You get the correct mail server names from your mail provider.
Do you have an existing email address? If so, what is the part of
your email address after the @ symbol? That part represents your
mail service provider.
Your mail provider will typically have a web page that shows how to
set up an email program. If you need more help, tell us the name of
your email service provider. If you currently don't have an email
address, we can help with that also.
Once you have the correct server name, you can edit the account
details by going to Tools, Accounts, select that account, Properties,
Servers.