+General
+-------
+
+Notmuch now requires gmime >= 2.6.7. The gmime 2.4 series is no longer
+supported.
+
+Database revision tracking: `lastmod:` queries
+
+ Each message now has a metadata revision number that increases with
+ every tagging operation. See the discussion of `lastmod:` in
+ `notmuch-search-terms(7)` for more information.
+
+Date queries now support `date:<expr>..!` shorthand for
+`date:<expr>..<expr>`
+
+ You can use, for example, `date:yesterday..!` to match from the
+ beginning of yesterday to the end of yesterday. For further details,
+ please refer to the `notmuch-search-terms` manual page.
+
+Notmuch database upgrade to support `lastmod:` queries
+
+ The above mentioned `lastmod:` prefix. This will be done
+ automatically, without prompting on the next time `notmuch new` is
+ run after the upgrade. The upgrade is not reversible, and the
+ upgraded database will not be readable by older versions of
+ Notmuch. As a safeguard, a database dump will be created in the
+ `.notmuch` directory before upgrading.
+
+Build System
+------------
+
+The ruby bindings are now built as part of the main notmuch build
+process. This can be disabled with the `--without-ruby` option to
+configure.
+
+Building the documentation can be disabled with the `--without-docs`
+option to configure.
+
+Skipped individual tests are no longer considered as failures.
+
+Command Line Interface
+----------------------
+
+Database revision tracking
+
+ Two new options were added to support revision tracking. A global
+ option "--uuid" (`notmuch(1)`) was added for to detect counter
+ rollover and reinitialization, and `notmuch-count(1)` gained a
+ `--lastmod` option to query database revision tracking data.
+
+The `notmuch address` command supports new deduplication schemes
+
+ `notmuch address` has gained a new `--deduplicate` option to specify
+ how the results should be deduplicated, if at all. The alternatives
+ are `no` (do not deduplicate, useful for processing the results with
+ external tools), `mailbox` (deduplicate based on the full, case
+ sensitive name and email address), and `address` (deduplicate based
+ on the case insensitive address part). See the `notmuch-address`
+ manual page for further information.
+
+Emacs Interface
+---------------
+
+`notmuch-emacs-version` is used in `User-Agent` header
+
+ The value of recently introduced variable `notmuch-emacs-version` is
+ now used as a part of `User-Agent` header when sending emails.
+
+Removed `notmuch-version` function by renaming it to `notmuch-cli-version`
+
+ With existing variable `notmuch-emacs-version` the accompanied
+ function which retrieves the version of `notmuch-command` is
+ better named as `notmuch-cli-version`.
+
+Query input now supports completion for "is:<tag>"
+
+New message composition mode: `notmuch-compose-mode`
+
+ This is mainly to fix fcc handling, but may be useful for user
+ customization as well.
+
+Bug fix for replying to encrypted messages in `notmuch-tree` mode
+
+Bind `l` in `notmuch-show` to limit or filter
+
+ Use this to narrow the search query in show buffers.
+
+Allow saved searched to specify tree view rather than search view
+
+ Applies to saved searches run from `notmuch-hello`, or by a keyboard
+ shortcut (`notmuch-jump`). Can be set in the customize interface, or
+ by adding :search-type tree to the appropriate saved search plist in
+ `notmuch-saved-searches`.
+
+Bind `S` in `notmuch-tree` to run the same search in `notmuch-search`
+
+ Analogous with `Z` in search view (which runs the current search in
+ tree view). It is particularly useful with saved searches that
+ specify tree view.
+
+Increase maximum size of rendered text parts
+
+ The variable `notmuch-show-max-text-part-size` controls the maximum
+ size (in bytes) which is automatically rendered. This may make
+ rendering large threads slower. To get the previous behaviour set
+ this variable to 10000.
+
+Library
+-------
+
+The use of absolute paths is now enforced when calling
+`notmuch_database_{open, create}`
+
+New function `notmuch_directory_delete` to delete directory documents
+
+ Previously there was no way to delete directory documents from the
+ database, leading to confusing results when the "ghost" directory
+ document of a renamed or deleted filesystem directory was
+ encountered every time the parent directory was being scanned by
+ `notmuch new`. The mtime of the old directory document was also used
+ if a directory by the same name was added again in the filesystem,
+ potentially bypassing the scan for the directory. The issues are
+ fixed by providing a library call to delete directory documents, and
+ deleting the old documents in `notmuch new` on filesystem directory
+ removal or rename.
+
+Database revision tracking
+
+ Revision tracking is supported via a new prefix "lastmod:" in the
+ query parser and the new function
+ `notmuch_database_get_revision`. For the latter, see `notmuch(3)`.
+
+New status code returning API for n_query_count_{messages,threads}
+
+Deprecated functions
+
+ `notmuch_query_search_threads`, `notmuch_query_search_messages`,
+ `notmuch_query_count_messages`, and `notmuch_query_count_threads`
+ are all deprecated as of this release. Clients are encouraged to
+ transition to the `_st` variants supporting better error reporting.
+
+nmbug-status
+------------
+
+`nmbug-status` now supports specifying the sort order for each view.
+
+Notmuch 0.20.2 (2015-06-27)
+===========================
+
+Emacs Interface
+---------------
+
+Bug fix for marking messages read in `notmuch-tree` mode.
+
+Notmuch 0.20.1 (2015-06-01)
+===========================
+
+Test Suite
+----------
+
+Work around apparent gdb bug on arm64.
+
+Notmuch 0.20 (2015-05-31)
+=========================
+
+Command-Line Interface
+----------------------
+
+There is a new `mimetype:` search prefix
+
+ The new `mimetype:` search prefix allows searching for the
+ content-type of attachments, which is now indexed. See the
+ `notmuch-search-terms` manual page for details.
+
+Path to gpg is now configurable
+
+ On systems with multiple versions of gpg, you can tell
+ notmuch which one to use by setting `crypto.gpg_path`
+
+Emacs
+-----
+
+Avoid rendering large text attachements.
+
+Improved rendering of CID references in HTML.
+
+Vim
+---
+
+Vim client now respects excluded tags.
+
+Notmuch-Mutt
+------------
+
+Support messages without Message-IDs.
+
+Library
+-------
+
+Undeprecate single message mboxes
+
+ It seems more trouble to remove this feature than expected, so
+ `notmuch new` will no longer nag about mboxes with a single message.
+
+New error logging facility
+
+ Clients should call `notmuch_database_status_string` to retrieve
+ output formerly printed to stderr.
+
+Several bug fixes related to stale iterators
+
+New status code returning API for n_query_search_{messages,thread}
+
+Fix for library `install_name` on Mac OS X
+
+Fix for rounding of seconds
+
+Documentation
+-------------
+
+Sphinx is now mandatory to build docs
+
+ Support for using rst2man in place of sphinx to build the
+ docmumentation has been removed.
+
+Improved notmuch-search-terms.7
+
+ The man page `notmuch-search-terms(7)` has been extended, merging
+ some material from the relicensed wiki.
+
+Contrib
+-------
+
+`notmuch-deliver` is removed. As far as we know, all functionality
+previously provided by `notmuch-deliver` should now be provided by
+`notmuch insert`, provided by the main notmuch binary.
+
+nmbug-status
+------------
+
+`nmbug-status` now only matches local branches when reading
+`status-config.json` from the `config` branch of the `NMBGIT`
+repository. To help new users running `nmbug-status`, `nmbug clone`
+now creates a local `config` branch tracking `origin/config`. Folks
+who use `nmbug-status` with an in-Git config (i.e. you don't use the
+`--config` option) who already have `NMBGIT` set up are encouraged to
+run:
+
+ git checkout config origin/config
+
+in their `NMBGIT` repository (usually `~/.nmbug`).
+
+Notmuch 0.19 (2014-11-14)
+=========================
+
+Overview
+--------
+
+This release improves the reliability of `notmuch dump` and the error
+handling for `notmuch insert`. The new `notmuch address` command is
+intended to make searching for email addresses more convenient. At the
+library level the revised handling of missing messages fixes at least
+one bug in threading. The release also includes several interface
+improvements to the emacs interface, most notably the ability to bind
+keyboard shortcuts to saved searches.
+
+Command-Line Interface
+----------------------
+
+Stopped `notmuch dump` failing if someone writes to the database
+
+ The dump command now takes the write lock when running. This
+ prevents other processes from writing to the database during the
+ dump which would cause the dump to fail. Note, if another notmuch
+ process already has the write lock the dump will not start, so
+ script callers should still check the return value.
+
+`notmuch insert` requires succesful message indexing for success status
+
+ Previously the `notmuch insert` subcommand indicated success even if
+ the message indexing failed, as long as the message was delivered to
+ file system. This could have lead to delivered messages missing
+ tags, etc. `notmuch insert` is now more strict, also requiring
+ succesful indexing for success status. Use the new `--keep` option
+ to revert to the old behaviour (keeping the delivered message file
+ and returning success even if indexing fails).
+
+`notmuch insert` has gained support for `post-insert` hook
+
+ The new `post-insert` hook is run after message delivery, similar to
+ `post-new`. There's also a new option `notmuch insert --no-hooks` to
+ skip the hook. See the notmuch-hooks(1) man page for details.
+
+`notmuch deliver` is deprecated
+
+ With this release we believe that `notmuch insert` has reached
+ parity with `notmuch deliver`. We recommend that all users of
+ `notmuch deliver` switch to `notmuch insert` as the former is
+ currently unmaintained.
+
+`notmuch search` now supports `--duplicate=N` option with `--output=messages`
+
+ Complementing the `notmuch search --duplicate=N --output=files`
+ options, the new `--duplicate=N --output=messages` combination
+ limits output of message IDs to messages matching search terms that
+ have at least `N` files associated with them.
+
+Added `notmuch address` subcommand
+
+ This new subcommand searches for messages matching the given search
+ terms, and prints the addresses from them. Duplicate addresses are
+ filtered out. The `--output` option controls which of the following
+ information is printed: sender addresses, recipient addresses and
+ count of duplicate addresses.
+