etc/dovecot/sieve/global.d/list.sieve

   1 require
   2  [ "date"
   3  , "fileinto"
   4  , "mailbox"
   5  , "variables"
   6  ];
   7
   8 if currentdate :matches "year"  "*" { set "year"  "${1}"; }
   9 if currentdate :matches "month" "*" { set "month" "${1}"; }
  10
  11 if exists "List-ID" {
  12         if header :matches "List-ID" "*<*.*.*>*" {
  13                 set "list"   "${2}";
  14                 set "domain" "${3}";
  15          }
  16         fileinto :create "Lists.${domain}.${list}.${year}.${month}";
  17         stop;
  18  }