indexes and searches email in maildir folders

 nmzmail is a tool, primarily to be used with mutt, for indexing and searching
 maildir folders. Based on the result of a search query using the search
 engine namazu2, nmzmail generates a maildir folder containing symbolic links
 to the mail(s) matching the query. A simple mutt macro makes it easy to use
 nmzmail from within mutt. nmzmail is similar to mairix (another email
 index/search program), but perhaps easier to use since it uses the query
 syntax of namazu2.
 .
 Features:
   - fast mail searching even with large quantities of mail
   - incremental index building
   - integrates very nicely into mutt
   - rich, but simple, query language including regex
   - query history