format and generates a set of cross-referenced HTML documents. Each file that
is created represents a separate message in the mail archive and contains
links to other articles, so that the entire archive can be browsed in a
number of ways by following links. Archives generated by Hypermail can be
incrementally updated, and Hypermail is set by default to only update
archives when changes are detected.
PR: ports/5364
Submitted by: Francis M J Hsieh <mjhsieh@life.nthu.edu.tw>