#!/usr/bin/env bash

eml(){
    maildirs="$HOME/Mail/*/INBOX/new/"
    find $maildirs -type f | wc -l
}

case "$1" in
    -n) m=$(eml)
        if ((m > 0)); then
            notify-send "New mail" "$m messages"
        fi
        ;;
    *) eml ;;
esac