1 # Frequently Asked Questions
5 ## How come this query matches mails in folder:2013? `notmuch search --output=files folder:inbox`
7 You have duplicates of a message (or messages) in both folders.
9 Notmuch searches are message based. Multiple files may be associated
10 with the same message (i.e. the files have identical Message-ID). A
11 `folder:` search will match the folder of any of the files. The
12 `--output=files` option outputs all the files of all matching messages.
14 ## Shouldn't notmuch support inline PGP?
16 [Why it might not be a good idea](https://dkg.fifthhorseman.net/notes/inline-pgp-harmful/)