Hypermail

Hypermail is a free program for creating email archives, in the form of cross-referenced HTML documents. It takes a file in Unix mbox format and generates an HTML archive, complete with an index and various sorting options. It is commonly used for creating mailing list archives, but it can archive any collection of emails. It was originally written in Common Lisp, but was rewritten in C by Kevin Hughes for its initial public release in 1994.