+ <b>show.extra_headers</b>
+ By default <a href='../notmuch-show-1/'>notmuch-show</a>(1) includes the following headers in struc‐
+ tured output if they are present in the message: <u>Subject</u>, <u>From</u>, <u>To</u>,
+ <u>Cc</u>, <u>Bcc</u>, <u>Reply-To</u>, <u>Date</u>. This option allows the specification of a
+ list of further headers to output.
+
+ History: This configuration value was introduced in notmuch 0.35.
+
+ Default: empty list.
+