MailSpammer is a simple mailing list manager for smaller e-mail lists, using procmail and Perl. MailSpammer does not require administrator access, aside from initial setup (creating e-mail aliases), and features subscription, unsubscription, moderation, and archiving. The goal is not to be a majordomo-alike mailing list manager, but instead to provide a lightweight way to handle basic list management tasks.
Great system, minor problem
This script is great, but it doesn't look for PostgreSQL in the default location (/usr/local/pgsql) when configuring php. Small change to fix this. Just add:
test -f /usr/local/pgsql/include/libpq-fe.h && INSTALL_PHP_POSTGRES=$TRUE