I use mhonarc - it works great, and it is written in Perl!

I run a cron against a mailbox file similar to:

/usr/local/bin/mhonarc -add -nolock -treverse -reverse -multipg -idxsi
+ze 500 -outdir /path/to/www/mail-archive -msgexcfilter "/regex-to-fil
+ter-out/i" -tidxfname index.html /path/to/mbox
[download]

I went back and forth between that and hypermail, and ultimately settled on mhonarc once I figured out how to use it.

Cheers

Update: added "-nolock" flag; I found that my command was failing for the last few days because something happened during an update; probably a server crash on my host's webserver.