ClearOS's 7.x's mail server is Cyrus IMAP 2.x This page is to coordinate testing of upcoming Cyrus IMAP 3.x , which brings new features such as CalDAV, CardDAV and JMAP support.
https://github.com/eglooca/cyrus-imapd
Mailbox creation gotcha: The mailboxes get created on the fly:
- the first time the user logs in, or
- a mail message is delivered