[ale] Indexing and searching very, very large Maildir

[jb at sourceillustrated.com (John Wells)]

Guys,

We have a very large directory in Maildir format that we need to
index, search and then view messages within. Large as in 672 Gigs and
growing. We used to use mairix, but it started choking at around the
200G mark.

Does anyone know of a tool, either open or commercial, that can do
this effectively? We have a budget for it...

Thanks!
John