/usr/share/zsh/functions/Misc/checkmail is in zsh-common 5.1.1-1ubuntu2.3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #!/bin/zsh
#
# This autoloadable function checks the folders specified as arguments
# for new mails. The arguments are interpreted in exactly the same way
# as the mailpath special zsh parameter (see zshparam(1)).
#
# If no arguments are given mailpath is used. If mailpath is empty, $MAIL
# is used and if that is also empty, /var/spool/mail/$LOGNAME is used.
# This function requires zsh-3.0.1 or newer.
#
emulate -L zsh
local file message
for file in "${@:-${mailpath[@]:-${MAIL:-/var/spool/mail/$LOGNAME}}}"
do
message="${${(M)file%%\?*}#\?}"
file="${file%%\?*}"
if [[ -d "$file" ]] then
file=( "$file"/**/*(.ND) )
if (($#file)) then
checkmail ${^file}\?$message
fi
elif test -s "$file" -a -N "$file"; then # this also sets $_ to $file
print -r -- "${(e)message:-You have new mail.}"
fi
done
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