Just to clarify something (trying not to confuse you).
These 3 examples I have given you all differ slightly. This is because setting up your mail will differ depending on which ISP or organization you are with.
In the FIRST example I pointed you to the person select IMAP.
In the second and third examples the person select POP.
Probably the third example is the nearest to what you want.
My guess is that you need to select POP.
If you do then you need the name of your incoming mail server and your outgoing mail server as shown in the third example.
Get them off your ISP.
For example I am with blueyonder and in those fields I put:
pop3.blueyonder.co.uk
smtp.blueyonder.co.uk
Yours of course will be different.