- query:<name>
+- property:<key>=<value>
+
The **from:** prefix is used to match the name or address of the sender
of an email message.
available if notmuch is built with **Xapian Field Processors** (see
below).
+The **property:** prefix searches for messages with a particular
+<key>=<value> property pair. Properties are used internally by notmuch
+(and extensions) to add metadata to messages. A given key can be
+present on a given message with several different values.
+
Operators
---------
Boolean
- **tag:**, **id:**, **thread:**, **folder:**, **path:**
+ **tag:**, **id:**, **thread:**, **folder:**, **path:**, **property:**
Probabilistic
**from:**, **to:**, **subject:**, **attachment:**, **mimetype:**