+database.hook_dir
+ Directory containing hooks run by notmuch commands. See
+ :any:`notmuch-hooks(5)`.
+
+ History: this configuration value was introduced in notmuch 0.32.
+
+ Default: See HOOKS, below.
+
+database.mail_root
+ The top-level directory where your mail currently exists and to
+ where mail will be delivered in the future. Files should be
+ individual email messages.
+
+ History: this configuration value was introduced in notmuch 0.32.
+
+ Default: For compatibility with older configurations, the value of
+ database.path is used if **database.mail\_root** is unset.
+
+database.path
+ Notmuch will store its database here, (in
+ sub-directory named ``.notmuch`` if **database.mail\_root**
+ is unset).
+
+ Default: see :ref:`database`
+
+index.decrypt
+ Policy for decrypting encrypted messages during indexing. Must be
+ one of: ``false``, ``auto``, ``nostash``, or ``true``.
+
+ When indexing an encrypted e-mail message, if this variable is set
+ to ``true``, notmuch will try to decrypt the message and index the
+ cleartext, stashing a copy of any discovered session keys for the
+ message. If ``auto``, it will try to index the cleartext if a
+ stashed session key is already known for the message (e.g. from a
+ previous copy), but will not try to access your secret keys. Use
+ ``false`` to avoid decrypting even when a stashed session key is
+ already present.
+
+ ``nostash`` is the same as ``true`` except that it will not stash
+ newly-discovered session keys in the database.
+
+ From the command line (i.e. during :any:`notmuch-new(1)`,
+ :any:`notmuch-insert(1)`, or :any:`notmuch-reindex(1)`), the user can
+ override the database's stored decryption policy with the
+ ``--decrypt=`` option.
+
+ Here is a table that summarizes the functionality of each of these
+ policies:
+
+ +------------------------+-------+------+---------+------+
+ | | false | auto | nostash | true |
+ +========================+=======+======+=========+======+
+ | Index cleartext using | | X | X | X |
+ | stashed session keys | | | | |
+ +------------------------+-------+------+---------+------+
+ | Index cleartext | | | X | X |
+ | using secret keys | | | | |
+ +------------------------+-------+------+---------+------+
+ | Stash session keys | | | | X |
+ +------------------------+-------+------+---------+------+
+ | Delete stashed session | X | | | |
+ | keys on reindex | | | | |
+ +------------------------+-------+------+---------+------+
+
+ Stashed session keys are kept in the database as properties
+ associated with the message. See ``session-key`` in
+ :any:`notmuch-properties(7)` for more details about how they can be
+ useful.
+
+ Be aware that the notmuch index is likely sufficient (and a
+ stashed session key is certainly sufficient) to reconstruct the
+ cleartext of the message itself, so please ensure that the notmuch
+ message index is adequately protected. DO NOT USE
+ ``index.decrypt=true`` or ``index.decrypt=nostash`` without
+ considering the security of your index.
+
+ Default: ``auto``.
+
+index.header.<prefix>
+ Define the query prefix <prefix>, based on a mail header. For
+ example ``index.header.List=List-Id`` will add a probabilistic
+ prefix ``List:`` that searches the ``List-Id`` field. User
+ defined prefixes must not start with 'a'...'z'; in particular
+ adding a prefix with same name as a predefined prefix is not
+ supported. See :any:`notmuch-search-terms(7)` for a list of existing
+ prefixes, and an explanation of probabilistic prefixes.
+
+maildir.synchronize\_flags
+ If true, then the following maildir flags (in message filenames)
+ will be synchronized with the corresponding notmuch tags:
+
+ +--------+-----------------------------------------------+
+ | Flag | Tag |
+ +========+===============================================+
+ | D | draft |
+ +--------+-----------------------------------------------+
+ | F | flagged |
+ +--------+-----------------------------------------------+
+ | P | passed |
+ +--------+-----------------------------------------------+
+ | R | replied |
+ +--------+-----------------------------------------------+
+ | S | unread (added when 'S' flag is not present) |
+ +--------+-----------------------------------------------+
+
+ The :any:`notmuch-new(1)` command will notice flag changes in
+ filenames and update tags, while the :any:`notmuch-tag(1)` and
+ :any:`notmuch-restore(1)` commands will notice tag changes and
+ update flags in filenames.
+
+ If there have been any changes in the maildir (new messages added,
+ old ones removed or renamed, maildir flags changed, etc.), it is
+ advisable to run :any:`notmuch-new(1)` before
+ :any:`notmuch-tag(1)` or :any:`notmuch-restore(1)` commands to
+ ensure the tag changes are properly synchronized to the maildir
+ flags, as the commands expect the database and maildir to be in
+ sync.
+
+ Default: ``true``.
+
+new.ignore
+ A list to specify files and directories that will not be searched
+ for messages by :any:`notmuch-new(1)`. Each entry in the list is either:
+
+ A file or a directory name, without path, that will be ignored,
+ regardless of the location in the mail store directory hierarchy.
+
+ Or: