Cyrus IMAP 3.4.0-rc1 Release Notes¶
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Major changes since the 3.2 series¶
Improved performance for users with large folders
LITERAL- maximum size is now honoured (RFC 7888)
Support for the ESORT (but not CONTEXT) extension from RFC 5267
Experimental Handling Message Disposition Notification with JMAP support (requires jmap_nonstandard_extensions: yes in imapd.conf(5)).
Experimental JMAP Backup extension (requires jmap_nonstandard_extensions: yes in imapd.conf(5)).
Experimental JMAP Notes extension (requires jmap_nonstandard_extensions: yes in imapd.conf(5)).
Experimental JMAP Blob extension (requires jmap_nonstandard_extensions: yes in imapd.conf(5)).
Experimental JMAP Mail extension (requires jmap_nonstandard_extensions: yes in imapd.conf(5)).
New cyrus.index format v17 adds changes_epoch field, needed by JMAP Backups extension
New reverseuniqueids imapd.conf(5) option (default on), which improves performance for users with large mailboxes
Further improvements to the reverseacls imapd.conf(5) performance option
Improvements to replication reliability and performance
Experimental vnd.cyrus.log and vnd.cyrus.jmapquery Sieve extensions
Experimental Sieve Snooze extension based on draft-ietf-extra-sieve-snooze
Experimental Sieve mailboxid extension based on draft-ietf-extra-sieve-mailboxid
Improvements to conversations
New mailbox_maxmessages_addressbook, mailbox_maxmessages_calendar, and mailbox_maxmessages_email imapd.conf(5) options for providing server-wide limits on the amount of objects in any one mailbox, independently of quotas. These default to 0 (unlimited) for backward compatibility, but are highly recommended for protecting your server from misbehaving clients.
New IMAP create/delete behaviour based on draft-ietf-extra-imap4rev2: mailboxes containing child mailboxes can no longer be deleted; and when creating mailboxes, ancestors will be created as needed.
Support for per-language indexing and searching
SNMP support has been removed, as it was broken and unmaintained
New sync_rightnow_channel imapd.conf(5) option to enable real-time replication to the specified channel as writes occur.
Caching of mailbox state for quicker replication turnaround. Configure sync_cache_db and sync_cache_db_path in imapd.conf(5) to enable.
New search-fuzzy-always annotation allows per-user override of the search_fuzzy_always imapd.conf(5) option
New lmtp_preparse imapd.conf(5) option for parsing incoming messages before locking the mailbox.
New search_index_skip_users and search_index_skip_domains imapd.conf(5) options for skipping indexing of particular users/domains.
The HTTP Admin module's Currently Running Services feature now works on the major BSDs (thanks Felix J. Ogris)
squatter(8) once again supports the
-soption to skip reindexing mailboxes which were not modified since the last index (Squat backend only)
squatter(8) now supports long options
Improvements to search query normalisation performance
Updates to default configuration¶
The cyr_info(8) conf, conf-all and conf-default subcommands accept an -s <version> argument to highlight imapd.conf(5) options that are new or whose behaviour has changed since the specified version. We recommend using this when evaluating a new Cyrus version to check which configuration options you will need to examine and maybe set or change during the process.
The annotation_definitions file is now loaded case-insensitively
Implementations may want to revisit their search_normalisation_max settings, but its default value 1000 is a good conservative choice. Current server-grade hardware may use 20000 or more.
None so far