This file is indexed.

/etc/Muttrc.d/gpg.rc is in mutt 1.7.2-1+deb9u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# -*-muttrc-*-
#
# Command formats for gpg.
# 
# $Id$
#
# %p    The empty string when no passphrase is needed,
#       the string "PGPPASSFD=0" if one is needed.
#
#       This is mostly used in conditional % sequences.
#
# %f    Most PGP commands operate on a single file or a file
#       containing a message.  %f expands to this file's name.
#
# %s    When verifying signatures, there is another temporary file
#       containing the detached signature.  %s expands to this
#       file's name.
#
# %a    In "signing" contexts, this expands to the value of the
#       configuration variable $pgp_sign_as.  You probably need to
#       use this within a conditional % sequence.
#
# %r    In many contexts, mutt passes key IDs to pgp.  %r expands to
#       a list of key IDs.

# Note that we explicitly set the comment armor header since GnuPG, when used
# in some localiaztion environments, generates 8bit data in that header, thereby
# breaking PGP/MIME.

# Note from the Debian mutt maintainers: starting from 1.7.0-2 GPGME is enabled
# by default. More info in NEWS.Debian.
# THe pgp_* commands are left here for people who disable gpgme in their
# ~/.muttrc
set crypt_use_gpgme=yes

# Note from the Debian mutt maintainers: the addition of
# "--pinentry-mode loopback" breaks gpgv1 compatiblity, if you need to use gpgv1
# remove that statement.

# decode application/pgp
set pgp_decode_command="gpg --status-fd=2 %?p?--passphrase-fd 0 --pinentry-mode=loopback? --no-verbose --quiet --batch --output - %f"

# verify a pgp/mime signature
set pgp_verify_command="gpg --status-fd=2 --no-verbose --quiet --batch --output - --verify %s %f"

# decrypt a pgp/mime attachment
set pgp_decrypt_command="gpg --status-fd=2 %?p?--passphrase-fd 0 --pinentry-mode=loopback? --no-verbose --quiet --batch --output - %f"

# create a pgp/mime signed attachment
set pgp_sign_command="gpg --no-verbose --batch --quiet --output - %?p?--passphrase-fd 0 --pinentry-mode=loopback? --armor --detach-sign --textmode %?a?-u %a? %f"

# create a application/pgp signed (old-style) message
set pgp_clearsign_command="gpg --no-verbose --batch --quiet --output - %?p?--passphrase-fd 0 --pinentry-mode=loopback? --armor --textmode --clearsign %?a?-u %a? %f"

# create a pgp/mime encrypted attachment
set pgp_encrypt_only_command="/usr/lib/mutt/pgpewrap gpg --batch --quiet --no-verbose --output - --encrypt --textmode --armor --always-trust -- -r %r -- %f"

# create a pgp/mime encrypted and signed attachment
set pgp_encrypt_sign_command="/usr/lib/mutt/pgpewrap gpg %?p?--passphrase-fd 0 --pinentry-mode=loopback? --batch --quiet --no-verbose --textmode --output - --encrypt --sign %?a?-u %a? --armor --always-trust -- -r %r -- %f"

# import a key into the public key ring
set pgp_import_command="gpg --no-verbose --import %f"

# export a key from the public key ring
set pgp_export_command="gpg --no-verbose --export --armor %r"

# verify a key
set pgp_verify_key_command="gpg --verbose --batch --fingerprint --check-sigs %r"

# read in the public key ring
set pgp_list_pubring_command="gpg --no-verbose --batch --quiet --with-colons --with-fingerprint --with-fingerprint --list-keys %r"

# read in the secret key ring
set pgp_list_secring_command="gpg --no-verbose --batch --quiet --with-colons --with-fingerprint --with-fingerprint --list-secret-keys %r"

# fetch keys
# set pgp_getkeys_command="pkspxycwrap %r"

# pattern for good signature - may need to be adapted to locale!

# set pgp_good_sign="^gpgv?: Good signature from "

# OK, here's a version which uses gnupg's message catalog:
# set pgp_good_sign="`gettext -d gnupg -s 'Good signature from "' | tr -d '"'`"

# This version uses --status-fd messages
set pgp_good_sign="^\\[GNUPG:\\] GOODSIG"

# pattern to verify a decryption occurred
set pgp_decryption_okay="^\\[GNUPG:\\] DECRYPTION_OKAY"