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 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 web interface be protected with this password.