- <b>--create-folder</b>
- Try to create the folder named by the <b>--folder</b> option, if it
- does not exist. Otherwise the folder must already exist for
- mail delivery to succeed.
+ <b>--decrypt=(true|nostash|auto|false)</b>
+ If <b>true</b> and the message is encrypted, try to decrypt the message
+ while indexing, stashing any session keys discovered. If <b>auto</b>,
+ and notmuch already knows about a session key for the message,
+ it will try decrypting using that session key but will not try
+ to access the user's secret keys. If decryption is successful,
+ index the cleartext itself. Either way, the message is always
+ stored to disk in its original form (ciphertext).
+
+ <b>nostash</b> is the same as <b>true</b> except that it will not stash
+ newly-discovered session keys in the database.
+
+ Be aware that the index is likely sufficient (and a stashed ses‐
+ sion 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 <b>--decrypt=true</b> or
+ <b>--decrypt=nostash</b> without considering the security of your in‐
+ dex.
+
+ See also <b>index.decrypt</b> in <a href='../notmuch-config-1/'>notmuch-config</a>(1).