On Mac Mail, and Outlook, How do I ensure that the outgoing server is using authentication?
A bad day at the office is if you’re entire email system goes down, apparently due to a firewall issue. This article documents with screenshots
mac-mail
Post Server Migration, All Mac IMAP Folders Missing
Synopsis After a server migration IMAP folders on Mac Mail 14 went missing. Solution Change the IMAP Prefix from INBOX to blank (empty) “” Reference