I’m completely new to Posties as well and only an amateur Admin…
I had to set up a cronjob with my provider, and only got it to work when I set up one that called the “not recommended” direct command. which is
https://www.yourblogsaddress.com/?postie=get-mail
see my providers setup page
https://www.magicon.de/skitching/jo//mycronjob-20151011-161652.jpg
but now it works fine
