apple mail preferences unable to set incoming server

What is the difference between POP and IMAP and which type should I choose? For security reasons we will at some point in the future turn off support for non-secure connections.

Please ensure you are using the port numbers above and that your connection is encrypted. So you may be required to use the SMTP server assigned by your ISP. IMPORTANT NOTE: Some broadband connections may not allow sending e-mail through another ISP like us. (Choose TLS if you don't have this option. Server requires encrypted connection (STARTTLS). The most common mistake we get is people just entering their name here or leaving it blank. Outgoing mail server (SMTP) requires password authentication, same as incoming mail server

Server requires encrypted connection (SSL). Password = The password you set when creating the account in DirectAdmin The most common mistake we get is people just entering their name here or leaving it blank. These basic settings can be used with all email programs: If you have not done this log into the control panel at and under the E-mail Management heading click 'Email Accounts' then 'Create Mail Account' Before you can use your email you will need to create your email accounts from the DirectAdmin control panel.

Apple mail preferences unable to set incoming server