+**index.repaired**
+
+ Some messages arrive in forms that are confusing to view; they can
+ be mangled by mail transport agents, or the sending mail user
+ agent may structure them in a way that is confusing. If notmuch
+ knows how to both detect and repair such a problematic message, it
+ will do so during indexing.
+
+ If it applies a message repair during indexing, it will use the
+ ``index.repaired`` property to note the type of repair(s) it
+ performed.
+
+ ``index.repaired=skip-protected-headers-legacy-display`` indicates
+ that when indexing the cleartext of an encrypted message, notmuch
+ skipped over a "legacy-display" text/rfc822-headers part that it
+ found in that message, since it was able to index the built-in
+ protected headers directly.
+
+ ``index.repaired=mixedup`` indicates the repair of a "Mixed Up"
+ encrypted PGP/MIME message, a mangling typically produced by
+ Microsoft's Exchange MTA. See
+ https://tools.ietf.org/html/draft-dkg-openpgp-pgpmime-message-mangling
+ for more information.
+