isync: free IMAP and MailDir mailbox synchronizer

isync is a command line application which synchronizes mailboxes; currently Maildir and IMAP4 mailboxes are supported. New messages, message deletions and flag changes can be propagated both ways. isync is suitable for use in IMAP-disconnected mode.

Synchronization is based on unique message identifiers (UIDs), so no identification conflicts can occur (as opposed to some other mail synchronizers).
Synchronization state is kept in one local text file per mailbox pair; multiple replicas of a mailbox can be maintained.

isync is free software in the sense of the GNU GPL v2.



isync should work fairly well with any IMAP4 compliant server; particularily efficient with those that support the UIDPLUS and LITERAL+ extensions.
Some servers require workarounds; see the README file for details.


While isync is the project name, mbsync is the current executable name; this change was necessary because of massive changes in the user interface. An isync executable still exists; it is a compatibility wrapper around mbsync.



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Last update: Sun May 24 19:19:30 CEST 2015.

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