Dovecot v2.3.10 Released

[Aki Tuomi]

We are pleased to release v2.3.10 of Dovecot. Please find it from
locations below:

https://dovecot.org/releases/2.3/dovecot-2.3.10.tar.gz
https://dovecot.org/releases/2.3/dovecot-2.3.10.tar.gz.sig
Binary packages in https://repo.dovecot.org/
Docker images in https://hub.docker.com/r/dovecot/dovecot

Aki Tuomi
Open-Xchange oy

---

* Disable retpoline migitations by default. These can cause severe
  performance regressions, so they should be only enabled when
  applicable.
* IMAP MOVE now commits transactions in batches of 1000 mails. This
  helps especially with lazy_expunge when moving a lot of mails. It
  mainly avoids situations where multiple IMAP sessions are running the
  same MOVE command and duplicating the mails in the lazy_expunge folder.
  With this change there can still be some duplication, but the MOVE
  always progresses forward. Also if the MOVE fails at some point, the
  changes up to the last 1000 mails are still committed instead of
  rolled back. Note that the COPY command behavior hasn't changed,
  because it is required by IMAP standard to be an atomic operation.
* IMAP EXPUNGE and CLOSE now expunges mails in batches of 1000 mails.
  This helps especially with lazy_expunge when expunging a lot of mails
  (e.g. millions) to make sure that the progress always moves forward
  even if the process is killed.
* Autoexpunging now expunges mails in batches of 1000 mails. This helps
  especially with lazy_expunge when expunging a lot of mails
  (e.g. millions) to make sure that the progress always moves forward
  even if the process is killed.
+ Add tool for generating sysreport called dovecot-sysreport.
  This generates a bundle of information usually needed for support
  requests.
+ Add support for the new IMAP \Important SPECIAL-USE flag (RFC 8457).
+ Add metric { group_by } setting. This allows automatically creating
  new metrics based on the fields you want to group statistics by.
  NOTE: This feature is considered experimental and syntax is subject
  to change in future release.
+ auth: Support SCRAM-SHA-256 authentication mechanism.
+ imap: Support the new IMAP STATUS=SIZE extension.
+ Use TCP_QUICKACK to reduce latency for some TCP connections.
+ quota-status: Made the service more robust against erroneous use with
  Postfix ACL policies other than smtpd_recipient_restrictions.
+ Add "revision" field support to imap_id_send setting. Using
  "revision *" will send in IMAP ID command response the short commit
  hash of the Dovecot git source tree HEAD (same as in dovecot --version).
+ IMAP ENVELOPE includes now all addresses when there are multiple
  headers (From, To, Cc, etc.) The standard way of having multiple
  addresses is to just list them all in a single header. It's
  non-standard to have multiple headers. However, since MTAs allow these
  mails to pass through and different software may handle them in
  different ways, it's better from security point of view to show all
  the addresses.
+ Event filters now support using "field_name=" to match a field that
  doesn't exist or has an empty value. For example use "error=" to match
  only events that didn't fail.
- acl: INBOX ACLs shouldn't apply for IMAP GETMETADATA/SETMETADATA
  commands.
- cassandra: CASS_ERROR_SERVER_WRITE_FAILURE error should also be
  treated as "uncertain write failure".
- dict-redis: Using quota_clone configured with dict-redis could have
  crashed when Redis responded slowly.
- imap-hibernate: Communication trouble with imap-master leads to
  segfault.
- imap-hibernate: Unhibernation retrying wasn't working.
- imap: Fixed auth lookup privilege problem when imap process was reused
  and user was being un-hibernated.
- Fix potential crash when copying/moving mails within the same folder.
  This happened only when there were a lot of fields in dovecot.index.cache.
- lib-index: Recreating dovecot.index.cache file could have crashed when
  merging bitmask fields.
- lib-index: Using public/shared folders with INDEXPVT configured to use
  private \Seen flags, trying to search seen/unseen in an empty folder
  crashes with segfault.
- lib-mail: Large base64-encoded mails weren't decoded properly.
  This could have affected searching/indexing mails and message snippet
  generation.
- lib-mail: Message with only quoted text could have caused message
  snippet to ignore its 200 character limit and return the entire
  message. This was added also to dovecot.index.cache file, which
  increased disk space and memory usage unnecessarily.
  v2.3.9.2 regression (previous versions cached the quoted snippet as
  empty). In a large mail quoted text could have become wrongly added
  to the snippet, possibly mixed together with non-quoted text.
- lib-smtp: client could have assert-crashed if STARTTLS handshake
  finished earlier than usually.
- lib-ssl-iostream: remove -static flag for lib-ssl-iostream linking to
  prevent a compile issue.
- lib-storage: Mailbox synchronization may have assert-crashed in some
  rare situations.
- lib-storage: mdbox didn't preserve date.saved with dsync.
- lib: Don't require EAI_{ADDRFAMILY,NODATA}, breaks FreeBSD
- master: Some services could respawn unthrottled if they crash during
  startup.
- push-notification: Do not send push_notification_finished event if
  nothing was done. This happens when mail transaction is started and
  ended with no changes.
- quota-status: Addresses with special characters in the local part caused
  problems in the interaction between Postfix and Dovecot. Postfix sent
  its own internal representation in the recipient field, while Dovecot
  expected a valid RFC5321 mailbox address.
- submission-login: SESSION was not correctly encoded field for the
  XCLIENT command. Particularly, a '+' character introduced by the
  session ID's Base64 encoding causes problems.
- submission: Fix submission_max_mail_size to work correctly on 32-bit
  systems.
- submission: Trusted connections crashed in second connection's EHLO
  if submission-login { service_count } is something else than 1 (which
  is the default).
- submission: XCLIENT command was never used in the protocol exchange
  with the relay MTA when submission_backend_capabilities is configured,
  even when the relay MTA was properly configured to accept the XCLIENT
  command.


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