mac hi sierra os.
Apple mail cannot connect to mail server. We checked it on another mac with the same os and it connects. It also connects with webmail so the password and user name are ok.
We turned ssl on and off and no difference. We checked all the settings with another mac and they are 100% the same as we put on this one mac that is not working.
Still cant authorise the mail account. check all settings and ports and they check ok. Its a pop account.