Yahoo mail, Verizon email, etc, when it comes to the region-specific email service provider like in Australia, Bigpond is on the top of the priority list of users.
have migrated bigpond to imap server from POP server, have deleted and reloaded bigpond email twice, Telstra are suggesting it's a Mac problem, bigpond email is working on all other devices incl iPad Air, iPad Mini 6 and 2 x android phones, server settings for Bigpond account match both...