Maildir with indixes

Hello Does anybody knows a Maildir variant that supports index databases to allow faster searching for e.g. subject/to/from headers? I'm looking for a way to store my old mail and archives and maildir seems to be the best fitting to search with grep/find but an index e.g. a berkeley db2 file t

Maildir with indixes

Hello Does anybody knows a Maildir variant that supports index databases to allow faster searching for e.g. subject/to/from headers? I'm looking for a way to store my old mail and archives and maildir seems to be the best fitting to search with grep/find but an index e.g. a berkeley db2 file