synchronize IMAP4 and maildir mailboxes
isync is a command line application which synchronizes a local maildir-style mailbox with a remote IMAP4 mailbox. It is suitable for use in IMAP-disconnected mode. Multiple copies of the remote IMAP4 mailbox can be maintained, and all flags are synchronized.
Homepage: https://isync.sourceforge.net/
Maintainer: Klemens Nanni <kn@openbsd.org>