From the Email Sentinel Pro main interface, click on "Mail Accounts" from the left sided menu. Email Sentinel Pro can handle POP3, IMAP or Hotmail email accounts and it works with any email client which supports these account types, such as MS-Outlook, Outlook Express, IncrediMail, etc.
If you are unsure about your email account type, then just select "I don't know the type(s) of my incoming mail server(s)". Email Sentinel Pro will apply your selection on every email account that you use.