Exchange Shared Mailboxes
Receiving Emails from Exchange Shared Mailboxes
mail.imaps.auth.plain.disable = true
mail.imap.auth.plain.disable = true
cmsbs.mail.imap.user = "DOMAIN\\SYSTEM_USERNAME\\MAILBOX_NAME"
See also: https://javaee.github.io/javamail/docs/api/com/sun/mail/imap/package-summary.html