This file is indexed.

/etc/t-prot/Muttrc is in t-prot 2.101-3.

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

The actual contents of the file can be viewed below.

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set display_filter='t-prot -cmekatlS --max-lines=250 --bigq --pgp-short --pgp-move-vrf -Mmutt -L/etc/t-prot/footers -A/etc/t-prot/ads'
# set it to '' to turn it off by default

# toggle TOFU protection with ESC-0 (off) and ESC-1 (on)
macro generic \e0 ":unset display_filter\n" "Turn TOFU protection off"
macro generic \e1 ":set display_filter='t-prot -cmekatlS --max-lines=250 --bigq --pgp-short --pgp-move-vrf -Mmutt -L/etc/t-prot/footers -A/etc/t-prot/ads'\n" "Turn TOFU protection on"

# same in pager mode - ugly but what the hell...
macro pager \e0 ":unset display_filter; exec exit\n:exec display-message\n" "Turn TOFU protection off"
macro pager \e1 ":set display_filter='t-prot -cmekatlS --max-lines=250 --bigq --pgp-short --pgp-move-vrf -Mmutt -L/etc/t-prot/footers -A/etc/t-prot/ads'; exec exit\n:exec display-message\n" "Turn TOFU protection on"

# highlight TOFU protection:
color body	brightmagenta		black	"^\\[---.*"
color body	green			black	"^#v[-+]"