#!/bin/zsh
set -e
zmodload zsh/stat
find . -type f -ctime +30 . | while read i; do
  [[ "$(sed -n '0,/^$/{/^X-Spam-Flag: Yes/p}' <"$i")" = "" ]] && rm -f "$i" || {
    dd=$(stat +ctime -F "%Y%m" "$i")
    [[ -d ".$dd" ]] || mkdir -p ".$dd" ".$dd/new" ".$dd/cur" ".$dd/tmp"
    mv -f "$i" ".$dd/cur/"
  }
done