Why is my POP account not working after I upgraded to El Capitan? I sometimes can get mail and then it stops working so the problem is intermittent.
When I contacted GoDaddy thinking it was their shenanigans that caused the POP to stop, he advised me that El Cap was at fault. He wanted to "fix" it by charging me an additional $97/yr. I said no and after whining a little, he gave me the same instructions posted here. However, he did tell me this fix was only temporary.