Disallow Email Posting
A mailing list can be set to disallow all email posting, and require all postings to be contributed through the web interface. This allows you to get rid of all the authentication
issues that accompany email, and is considered very secure.
Some sites put the Lyris web interface on a web server behind a firewall, where no-one from the outside can reach it. In addition, most web servers have password-based security access features, and
the entire Lyris web interface be protected with this password.
Optionally, if you want outsiders to have access to the web interface, you can place a copy of the Lyris web interface program on a publicly available web server, but with features removed from it,
so they cannot abuse the script, no matter what. Because the Perl source code to the Lyris web interface is included with Lyris, it is very easy to remove features such as "create a message" and
"read messages" from the Lyris web interface. Some of our most security conscious customers, such as banks, use this technique.